Problem with jQuery plugin name

I have added a new jQuery json plugin to the js_libraries folder and created the json.info file. In the info file, name is given as jquery_json and the same name is displayed in the JavaScript libraries screen also. But when I try to add the JavaScript library using drupal_add_js_library("jquery_json"), the library is not getting included. But when I try to include using drupal_add_js_library("json"), the library is included.

Do we need to use the name in the info file or the name of the info file?