I guess a giraffe is spelled "Jiraffe" same with:
Jinjer (Ginger)
Jiant (Giant)
Jigabyte (Gigabyte)
Jerm (Germ)
Jenerate (Generate)
Jel (Gel)
Caje (Cage)
Dodje (Dodge)
Jem (Gem)
Jentle (Gentle)
and the list goes on..
Also I don't care if it's Graphics Interchange Format, if it stands for that it should be pronounced G.I.F (Gee I Eff) and that just sounds weird, so it should be pronounced like a normal English word, and if there is a gi/ge/gy in an English word it's pronounced as "j".