Yes, this is an old question. But this is misleading, as this was the first result in my search, and both answers are no longer correct.
You can change your Github account name at any time.
To do this, click your profile picture> Settings > Account Settings > Change Username .
Links to your repositories will be redirected to new URLs, but they must be updated on other sites, because whoever selects your abandoned username may override the links. Links to your profile page will be 404'd.
See the official help page for more information.
Aaron Cruz Sep 11 '15 at 13:55 2015-09-11 13:55
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