Github shows name instead of a linked username in commits

Question

I just helped a friend to set up a Github account to collaborate on my project. His commits come through, but for some reason on the \"Source\" page of my repository next to

Answer 1

Does your friend have the e-mail address he is using for his commits correctly set up as an alias in GitHub? Otherwise, how is GitHub to know who he is? Git itself only records the full name and the e-mail address and obviously not the GitHub username, since you can use Git perfectly fine without GitHub.