Does it matter? "Regular" people won't pick up on the reference to git, but it's still a nice short domain name, easy to spell and pronounce, and git is a slang spelling for get. I think the name works well.
In my book, not exactly. It's more like the mildest possible term of abuse. You could generally get away with calling someone a git to their face and in front of their grandmother. Assuming they'd done something tricksy or cheeky or grumpy.
