If you want to edit a plugin's name, use this guide. This guide uses the .obj importer as an example.
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Get the name of the plugin. Click the "Plugins" menu, and find it there. In this case "OBJ Importer".
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Go to Google SketchUp's Plugin folder, right click on the plugin ("obj_importer.rb") and select "Edit with Notepad++". You need to have Notepad++ installed, and I recommend it. NP++ has syntax highlighting.
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Find (Ctrl+F) "UI.menu": "menu = UI.menu("Plugins").add_submenu("OBJ Importer")"
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You'll want to edit the name in the quotes. (".add_submenu("Plugin Name Here")
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Restart or Open SketchUp, and your plug-in should have it's name edited.
NOTE: I recommend keeping a backup of the original source if you want to re-share the plugin.