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It’s a shortcut for Janine. J for J and nine for 9. But why would anyone use that? Sounds like a kid’s excuse for being lazy.
My cousin’s nickname is J9. I swear it’s because she can’t spell her own name.
My teacher called me J9. I told her I was not a 9-year-old.
My crush’s name is Janine, but I call her J9. It sounds cool, even if it’s stupid.