Favicon can be in different names with the help of link tag. Using the simple favelet I wrote, you can save favicon of any site. Just follow those simple steps..
Step 1. Drag this link to your bookmarks bar:
Step 2. Click on this bookmark on the site you want to get favicon. It will open a new window with favicon loaded. Right click the favicon and save it. For this feature to work you need to disable all popup blockers if there is any. Otherwise favelet won’t work.
You can use various online tools to convert favicon to png or other formats.