but seriously, any time some one says they use the J sound, they explain by spelling it JIF. It's just a joke though. No one cares how you pronounce it.
I can't think of another word where spelling it correctly isn't enough. One must also convey the way they pronounce the word too. The people need to know.
Yes, but you didn't feel the need to add a note about how you pronounced it just now. And I don't care if you know how to say it right. Doesn't matter in text.