Joby

I think it's adorable and fresh. It's used far less than Joey, which is getting kind of old.
It's also a safer bet than Job if you don't like the religious connections, or the chance of it getting mispronounced.
Joby is a winner!

Lol. This sounds ridiculous.

Not crazy about it.

Sounds like a bathroom saying "I gotta make a jobby".

I must say that this one sounds ridiculous, like the nickname of a chubby little boy in the country.