Re: GIF vs JIF
Why do some people believe etymology determines pronunciation? That's as unreliable a rule for English words as you could hope to find.
As has been widely documented, Steve Wilhite, who invented the format, has always pronounced it with a soft "G" as a pun on the name of JIF brand peanut butter. That's at least as strong an argument for the soft-G pronunciation as any of the (mostly spurious) ones for the hard-G one.
Ultimately, of course, it doesn't fucking matter, because the dominant pronunciation will be determined by use, and both forms are recognizable to pretty much the same audience.