Mine isn't original either.
My first name is Joanne and my brother calls me 'J', not Jo like most people but just an initial. That was too short for a forum so I just spelled it the way it sounded 'jaye' and I was too lazy to make the j uppercase
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I'm jaye everywhere except one site and there I am jaye4 (4 is my favourite number). Have the username since I started 10 years ago or so.