Is it possible to search for a particular filename on GitHub?

I know that the GitHub web interface lets you search all repositories for files with a particular pathname (e.g. searching for path:/app/models/user.rb yields > 109k results), but is there a way to search all repositories for filenames independent of their subdirectory location? I tried using asterisks in the path argument, and that didn't seem to work.

Does the search user.rb in:path do what you want to do? Alternatively there is also this search filename:user.rb

Found on: https://help.github.com/articles/searching-code/

In search input, you can use filename parameter to search in multiple repositories, for example:

filename:my_filename.txt

If you're looking for a filename in specific repository, you can just press t and start typing the file name (see: GH keyboard shortcuts).