diff --git a/metatag.module b/metatag.module
index ec7cb64..ccabf92 100644
--- a/metatag.module
+++ b/metatag.module
@@ -23,6 +23,7 @@
 use Drupal\taxonomy\Plugin\migrate\source\d7\Term;
 use Drupal\taxonomy\TermInterface;
 use Drupal\user\Plugin\migrate\source\d7\User;
+use Drupal\metatag\MigrateHelper;
 
 /**
  * Implements hook_help().
@@ -627,6 +628,12 @@ function metatag_generate_entity_metatags($entity) {
  * Implements hook_migrate_prepare_row().
  */
 function metatag_migrate_prepare_row(Row $row, MigrateSourceInterface $source, MigrationInterface $migration) {
+  // If there's no 'metatag' table in the source, there's no point in
+  // continuing.
+  if (!$source->getDatabase()->schema()->tableExists('metatag')) {
+    return;
+  }
+
   // @todo Write a more general version rather than hard-coded.
   // Support a know subset of D7 sources.
   if (is_a($source, Node::class)) {
@@ -645,6 +652,7 @@ function metatag_migrate_prepare_row(Row $row, MigrateSourceInterface $source, M
     // Not supported now, nothing to do.
     return;
   }
+
   if ($migration->getDestinationPlugin() instanceof EntityContentBase) {
     $entity_type = NULL;
     $entity_id = NULL;
@@ -681,25 +689,35 @@ function metatag_migrate_prepare_row(Row $row, MigrateSourceInterface $source, M
       }
     }
 
-    $metatag = [];
+    $metatags = [];
     foreach ($query->execute()->fetchCol() as $data_entry) {
       // Re-shape D7 entries into for D8 entries.
       // @todo This could live in a migrate process plugin.
-      foreach (unserialize($data_entry) as $metatag_name => $data) {
+      foreach (unserialize($data_entry) as $d7_metatag_name => $data) {
+        // Convert the D7 meta tag name to the D8 equivalent. If this meta tag
+        // is not recognized, skip it.
+        $d8_metatag_name = MigrateHelper::mapMetatagD7($d7_metatag_name);
+        if ($d8_metatag_name === FALSE) {
+          continue;
+        }
+
+        // If there's no data for this tag, ignore everything.
         if (empty($data)) {
-          // Nothing to do.
           continue;
         }
+
+        // @todo Skip these values for now, maybe an some version supported
+        // these?
         if (!is_array($data) || empty($data['value'])) {
-          // @todo Skip these values for now, maybe an some version supported
-          // these?
           continue;
         }
+
         // Keep the entire data structure.
-        $metatag[$metatag_name] = $data;
+        $metatags[$d8_metatag_name] = $data;
       }
     }
-    $row->setSourceProperty('field_metatag', serialize($metatag));
+
+    $row->setSourceProperty('field_metatag', serialize($metatags));
   }
 }
 
diff --git a/tests/fixtures/drupal7.php b/tests/fixtures/drupal7.php
index 18e7cc5..bf0ec7f 100644
--- a/tests/fixtures/drupal7.php
+++ b/tests/fixtures/drupal7.php
@@ -71,28 +71,42 @@
     'entity_id' => '998',
     'revision_id' => '998',
     'language' => 'und',
-    'data' => serialize(['keywords' => ['value' => 'keynoderevision']]),
+    'data' => serialize([
+      // A very basic meta tag.
+      'keywords' => ['value' => 'keynoderevision'],
+      // A meta tag that changed its tag name in D8.
+      'canonical' => ['value' => 'the-node'],
+    ]),
   ])
   ->values([
     'entity_type' => 'node',
     'entity_id' => '998',
     'revision_id' => '999',
     'language' => 'und',
-    'data' => serialize(['keywords' => ['value' => 'keynode']]),
+    'data' => serialize([
+      'keywords' => ['value' => 'keynode'],
+      'canonical' => ['value' => 'the-node'],
+    ]),
   ])
   ->values([
     'entity_type' => 'user',
     'entity_id' => '2',
     'revision_id' => '0',
     'language' => 'und',
-    'data' => serialize(['keywords' => ['value' => 'keyuser']]),
+    'data' => serialize([
+      'keywords' => ['value' => 'keyuser'],
+      'canonical' => ['value' => 'the-node'],
+    ]),
   ])
   ->values([
     'entity_type' => 'taxonomy_term',
     'entity_id' => '152',
     'revision_id' => '0',
     'language' => 'und',
-    'data' => serialize(['keywords' => ['value' => 'keytaxonomy2']]),
+    'data' => serialize([
+      'keywords' => ['value' => 'keytaxonomy2'],
+      'canonical' => ['value' => 'the-term'],
+    ]),
   ])
   ->execute();
 
diff --git a/tests/src/Kernel/Migrate/d7/MigrateMetatagTest.php b/tests/src/Kernel/Migrate/d7/MigrateMetatagTest.php
index b23223d..5a117b7 100644
--- a/tests/src/Kernel/Migrate/d7/MigrateMetatagTest.php
+++ b/tests/src/Kernel/Migrate/d7/MigrateMetatagTest.php
@@ -111,24 +111,24 @@ public function testMetatag() {
     $node = Node::load(998);
     $this->assertTrue($node instanceof NodeInterface);
     $this->assertTrue($node->hasField('field_metatag'));
-    $this->assertSame('a:1:{s:8:"keywords";a:1:{s:5:"value";s:7:"keynode";}}', $node->field_metatag->value);
+    $this->assertSame('a:2:{s:8:"keywords";a:1:{s:5:"value";s:7:"keynode";}s:13:"canonical_url";a:1:{s:5:"value";s:8:"the-node";}}', $node->field_metatag->value);
 
     $node = node_revision_load(998);
     $this->assertTrue($node instanceof NodeInterface);
     $this->assertTrue($node->hasField('field_metatag'));
-    $this->assertSame('a:1:{s:8:"keywords";a:1:{s:5:"value";s:15:"keynoderevision";}}', $node->field_metatag->value);
+    $this->assertSame('a:2:{s:8:"keywords";a:1:{s:5:"value";s:15:"keynoderevision";}s:13:"canonical_url";a:1:{s:5:"value";s:8:"the-node";}}', $node->field_metatag->value);
 
     /** @var \Drupal\user\Entity\User $user */
     $user = User::load(2);
     $this->assertTrue($user instanceof UserInterface);
     $this->assertTrue($user->hasField('field_metatag'));
-    $this->assertSame('a:1:{s:8:"keywords";a:1:{s:5:"value";s:7:"keyuser";}}', $user->field_metatag->value);
+    $this->assertSame('a:2:{s:8:"keywords";a:1:{s:5:"value";s:7:"keyuser";}s:13:"canonical_url";a:1:{s:5:"value";s:8:"the-node";}}', $user->field_metatag->value);
 
     /** @var \Drupal\taxonomy\Entity\Term $term */
     $term = Term::load(152);
     $this->assertTrue($term instanceof TermInterface);
     $this->assertTrue($term->hasField('field_metatag'));
-    $this->assertSame('a:1:{s:8:"keywords";a:1:{s:5:"value";s:12:"keytaxonomy2";}}', $term->field_metatag->value);
+    $this->assertSame('a:2:{s:8:"keywords";a:1:{s:5:"value";s:12:"keytaxonomy2";}s:13:"canonical_url";a:1:{s:5:"value";s:8:"the-term";}}', $term->field_metatag->value);
   }
 
 }
diff --git a/src/MigrateHelper.php b/src/MigrateHelper.php
new file mode 100644
index 0000000..fb13bb7
--- /dev/null
+++ b/src/MigrateHelper.php
@@ -0,0 +1,352 @@
+<?php
+
+namespace Drupal\metatag;
+
+/**
+ * Helpers for migrating data using Migrate API.
+ */
+class MigrateHelper {
+
+  /**
+   * Convert a D7 meta tag to the appropriate D8 structure.
+   *
+   * @param string $old_tag
+   *   The old tag name.
+   *
+   * @return bool|string
+   *   The D8 version of this meta tag, or FALSE if not recognized.
+   */
+  static public function mapMetatagD7($old_tag_name) {
+    $new_tag_name = $old_tag_name;
+
+    $d7_tags = [
+      // From the main Metatag module.
+      'abstract' => 'abstract',
+      'cache-control' => '',
+      'canonical' => 'canonical_url',
+      'content-language' => 'content_language',
+      'description' => 'description',
+      'expires' => '',
+      'generator' => 'generator',
+      'geo.placename' => 'geo_placename',
+      'geo.position' => 'geo_position',
+      'geo.region' => 'geo_region',
+      'icbm' => 'icbm',
+      'image_src' => 'image_src',
+      'keywords' => 'keywords',
+      'news_keywords' => 'news_keywords',
+      'next' => '',
+      'original-source' => 'original_source',
+      'pragma' => '',
+      'prev' => '',
+      'rating' => 'rating',
+      'referrer' => 'referrer',
+      'refresh' => '',
+      'revisit-after' => '',
+      'rights' => 'rights',
+      'robots' => 'robots',
+      'set_cookie' => 'set_cookie',
+      'shortlink' => 'shortlink',
+      'standout' => 'standout',
+      'title' => 'title',
+      // From metatag_app_links.metatag.inc:
+      'al:android:package' => '',
+      'al:android:url' => '',
+      'al:android:class' => '',
+      'al:android:app_name' => '',
+      'al:ios:url' => '',
+      'al:ios:app_store_id' => '',
+      'al:ios:app_name' => '',
+      'al:ipad:url' => '',
+      'al:ipad:app_store_id' => '',
+      'al:ipad:app_name' => '',
+      'al:iphone:url' => '',
+      'al:iphone:app_store_id' => '',
+      'al:iphone:app_name' => '',
+      'al:windows_phone:url' => '',
+      'al:windows_phone:app_id' => '',
+      'al:windows_phone:app_name' => '',
+      'al:windows:url' => '',
+      'al:windows:app_id' => '',
+      'al:windows:app_name' => '',
+      'al:windows_universal:url' => '',
+      'al:windows_universal:app_id' => '',
+      'al:windows_universal:app_name' => '',
+      'al:web:url' => '',
+      'al:web:should_fallback' => '',
+      // From metatag_dc.metatag.inc:
+      'dcterms.title' => '',
+      'dcterms.creator' => '',
+      'dcterms.subject' => '',
+      'dcterms.description' => '',
+      'dcterms.publisher' => '',
+      'dcterms.contributor' => '',
+      'dcterms.date' => '',
+      'dcterms.type' => '',
+      'dcterms.format' => '',
+      'dcterms.identifier' => '',
+      'dcterms.source' => '',
+      'dcterms.language' => '',
+      'dcterms.relation' => '',
+      'dcterms.coverage' => '',
+      'dcterms.rights' => '',
+      // From metatag_dc_advanced.metatag.inc:
+      'dcterms.abstract' => '',
+      'dcterms.accessRights' => '',
+      'dcterms.accrualMethod' => '',
+      'dcterms.accrualPeriodicity' => '',
+      'dcterms.accrualPolicy' => '',
+      'dcterms.alternative' => '',
+      'dcterms.audience' => '',
+      'dcterms.available' => '',
+      'dcterms.bibliographicCitation' => '',
+      'dcterms.conformsTo' => '',
+      'dcterms.created' => '',
+      'dcterms.dateAccepted' => '',
+      'dcterms.dateCopyrighted' => '',
+      'dcterms.dateSubmitted' => '',
+      'dcterms.educationLevel' => '',
+      'dcterms.extent' => '',
+      'dcterms.hasFormat' => '',
+      'dcterms.hasPart' => '',
+      'dcterms.hasVersion' => '',
+      'dcterms.instructionalMethod' => '',
+      'dcterms.isFormatOf' => '',
+      'dcterms.isPartOf' => '',
+      'dcterms.isReferencedBy' => '',
+      'dcterms.isReplacedBy' => '',
+      'dcterms.isRequiredBy' => '',
+      'dcterms.isVersionOf' => '',
+      'dcterms.issued' => '',
+      'dcterms.license' => '',
+      'dcterms.mediator' => '',
+      'dcterms.medium' => '',
+      'dcterms.modified' => '',
+      'dcterms.provenance' => '',
+      'dcterms.references' => '',
+      'dcterms.replaces' => '',
+      'dcterms.requires' => '',
+      'dcterms.rightsHolder' => '',
+      'dcterms.spatial' => '',
+      'dcterms.tableOfContents' => '',
+      'dcterms.temporal' => '',
+      'dcterms.valid' => '',
+      // From metatag_facebook.metatag.inc:
+      'fb:admins' => '',
+      'fb:app_id' => '',
+      'fb:pages' => '',
+      'shortcut icon' => '',
+      'mask-icon' => '',
+      'icon_16x16' => '',
+      'icon_32x32' => '',
+      'icon_96x96' => '',
+      'icon_192x192' => '',
+      'apple-touch-icon' => '',
+      'apple-touch-icon_72x72' => '',
+      'apple-touch-icon_76x76' => '',
+      'apple-touch-icon_114x114' => '',
+      'apple-touch-icon_120x120' => '',
+      'apple-touch-icon_144x144' => '',
+      'apple-touch-icon_152x152' => '',
+      'apple-touch-icon_180x180' => '',
+      'apple-touch-icon-precomposed' => '',
+      'apple-touch-icon-precomposed_72x72' => '',
+      'apple-touch-icon-precomposed_76x76' => '',
+      'apple-touch-icon-precomposed_114x114' => '',
+      'apple-touch-icon-precomposed_120x120' => '',
+      'apple-touch-icon-precomposed_144x144' => '',
+      'apple-touch-icon-precomposed_152x152' => '',
+      'apple-touch-icon-precomposed_180x180' => '',
+      // From metatag_google_cse.metatag.inc:
+      'thumbnail' => '',
+      'department' => '',
+      'audience' => '',
+      'doc_status' => '',
+      'google_rating' => '',
+      // From metatag_google_plus.metatag.inc:
+      'itemtype' => '',
+      'itemprop:name' => '',
+      'itemprop:description' => '',
+      'itemprop:image' => '',
+      'author' => '',
+      'publisher' => '',
+      // From metatag_hreflang.metatag.inc:
+      'hreflang_xdefault' => '',
+      // @todo 'hreflang_' . $langcode => '',
+      // From metatag_mobile.metatag.inc:
+      'theme-color' => '',
+      'MobileOptimized' => '',
+      'HandheldFriendly' => '',
+      'viewport' => '',
+      'cleartype' => '',
+      'amphtml' => '',
+      'alternate_handheld' => '',
+      'apple-itunes-app' => '',
+      'apple-mobile-web-app-capable' => '',
+      'apple-mobile-web-app-status-bar-style' => '',
+      'apple-mobile-web-app-title' => '',
+      'format-detection' => '',
+      'ios-app-link-alternative' => '',
+      'android-app-link-alternative' => '',
+      'android-manifest' => '',
+      'x-ua-compatible' => '',
+      'application-name' => '',
+      'msapplication-allowDomainApiCalls' => '',
+      'msapplication-allowDomainMetaTags' => '',
+      'msapplication-badge' => '',
+      'msapplication-config' => '',
+      'msapplication-navbutton-color' => '',
+      'msapplication-notification' => '',
+      'msapplication-square150x150logo' => '',
+      'msapplication-square310x310logo' => '',
+      'msapplication-square70x70logo' => '',
+      'msapplication-wide310x150logo' => '',
+      'msapplication-starturl' => '',
+      'msapplication-task' => '',
+      'msapplication-task-separator' => '',
+      'msapplication-tilecolor' => '',
+      'msapplication-tileimage' => '',
+      'msapplication-tooltip' => '',
+      'msapplication-window' => '',
+      // From metatag_opengraph.metatag.inc:
+      'og:site_name' => '',
+      'og:type' => '',
+      'og:url' => '',
+      'og:title' => '',
+      'og:determiner' => '',
+      'og:description' => '',
+      'og:updated_time' => '',
+      'og:see_also' => '',
+      'og:image' => '',
+      'og:image:url' => '',
+      'og:image:secure_url' => '',
+      'og:image:type' => '',
+      'og:image:width' => '',
+      'og:image:height' => '',
+      'og:latitude' => '',
+      'og:longitude' => '',
+      'og:street_address' => '',
+      'og:locality' => '',
+      'og:region' => '',
+      'og:postal_code' => '',
+      'og:country_name' => '',
+      'og:email' => '',
+      'og:phone_number' => '',
+      'og:fax_number' => '',
+      'og:locale' => '',
+      'og:locale:alternate' => '',
+      'article:author' => '',
+      'article:publisher' => '',
+      'article:section' => '',
+      'article:tag' => '',
+      'article:published_time' => '',
+      'article:modified_time' => '',
+      'article:expiration_time' => '',
+      'profile:first_name' => '',
+      'profile:last_name' => '',
+      'profile:username' => '',
+      'profile:gender' => '',
+      'og:audio' => '',
+      'og:audio:secure_url' => '',
+      'og:audio:type' => '',
+      'book:author' => '',
+      'book:isbn' => '',
+      'book:release_date' => '',
+      'book:tag' => '',
+      'og:video:url' => '',
+      'og:video:secure_url' => '',
+      'og:video:width' => '',
+      'og:video:height' => '',
+      'og:video:type' => '',
+      'video:actor' => '',
+      'video:actor:role' => '',
+      'video:director' => '',
+      'video:writer' => '',
+      'video:duration' => '',
+      'video:release_date' => '',
+      'video:tag' => '',
+      'video:series' => '',
+      // From metatag_opengraph_products.metatag.inc:
+      'product:price:amount' => '',
+      'product:price:currency' => '',
+      'product:availability' => '',
+      'product:brand' => '',
+      'product:upc' => '',
+      'product:ean' => '',
+      'product:isbn' => '',
+      'product:plural_title' => '',
+      'product:retailer' => '',
+      'product:retailer_title' => '',
+      'product:retailer_part_no' => '',
+      'product:mfr_part_no' => '',
+      'product:size' => '',
+      'product:product_link' => '',
+      'product:category' => '',
+      'product:color' => '',
+      'product:material' => '',
+      'product:pattern' => '',
+      'product:shipping_cost:amount' => '',
+      'product:shipping_cost:currency' => '',
+      'product:weight:value' => '',
+      'product:weight:units' => '',
+      'product:shipping_weight:value' => '',
+      'product:shipping_weight:units' => '',
+      'product:expiration_time' => '',
+      'product:condition' => '',
+      // From metatag_twitter_cards.metatag.inc:
+      'twitter:card' => '',
+      'twitter:site' => '',
+      'twitter:site:id' => '',
+      'twitter:creator' => '',
+      'twitter:creator:id' => '',
+      'twitter:url' => '',
+      'twitter:title' => '',
+      'twitter:description' => '',
+      'twitter:dnt' => '',
+      'twitter:image' => '',
+      'twitter:image:width' => '',
+      'twitter:image:height' => '',
+      'twitter:image:alt' => '',
+      'twitter:image0' => '',
+      'twitter:image1' => '',
+      'twitter:image2' => '',
+      'twitter:image3' => '',
+      'twitter:player' => '',
+      'twitter:player:width' => '',
+      'twitter:player:height' => '',
+      'twitter:player:stream' => '',
+      'twitter:player:stream:content_type' => '',
+      'twitter:app:country' => '',
+      'twitter:app:name:iphone' => '',
+      'twitter:app:id:iphone' => '',
+      'twitter:app:url:iphone' => '',
+      'twitter:app:name:ipad' => '',
+      'twitter:app:id:ipad' => '',
+      'twitter:app:url:ipad' => '',
+      'twitter:app:name:googleplay' => '',
+      'twitter:app:id:googleplay' => '',
+      'twitter:app:url:googleplay' => '',
+      'twitter:label1' => '',
+      'twitter:data1' => '',
+      'twitter:label2' => '',
+      'twitter:data2' => '',
+      // From metatag_verification.metatag.inc:
+      'msvalidate.01' => '',
+      'baidu-site-verification' => '',
+      'google-site-verification' => '',
+      'norton-safeweb-site-verification' => '',
+      'p:domain_verify' => '',
+      'yandex-verification' => '',
+    ];
+
+    // @todo Add drupal_alter().
+
+    // If the meta tag was known in D7, return the D8 name.
+    if (isset($d7_tags[$old_tag_name])) {
+      return $d7_tags[$old_tag_name];
+    }
+
+    return FALSE;
+  }
+
+}