How do you know if a graffiti name is being used or not?

Hello! I'm new to graffiti and I'm thinking of a new name to write, since my old one had 7 letters and imo it was too long and hard to write.

I want something short, but I don't wanna pick someones name by accident and disrespect them lol.

submitted by /u/NewOne-
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by /u/NewOne- via Graffiti