If this is connotation is intentional, perhaps as humor, please just tell me I'm not getting the joke.
The fact that the word has a negative connotation in the US is a bad coincidence. It however seems too late to change the name now.
But is it really so bad? Many people use Git and in Britain 'git' has similar negative connotations, as Nimrod does in the US.
I don't know. It's not like "Gimp", which is viewed by some as insulting to handicapped people. But it wasn't clear to me that the Nimrod developers were even aware of the US connotations, so I brought it up.
Perhaps the "Git" comparison is apt; as far as the US is concerned, that's the sort of name that's been picked.