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I have never seen "Git" written in all-caps, and I've seen no real indication that it's an acronym.

It looks like you may have stumbled upon this already, but according to Wikipedia, Linus said the following about Git's name:

> Torvalds has quipped about the name git, which is British English slang roughly equivalent to "unpleasant person". Torvalds said: "I'm an egotistical bastard, and I name all my projects after myself. First 'Linux', now 'git'." The man page describes git as "the stupid content tracker".

http://en.wikipedia.org/wiki/Git_(software)