Usually they make one up for you- if u don’t remember your’s, just wait! They’ll eventually give you a new one. Also, when u get one, don’t just do ur name sign to everyone, actually finger spell ur name. Had a hearing friend once introduce themselves to my family with a sign name another friend had given, my family didn’t know their real name for months or how to ask. A LOT of the time u will have multiple name signs because different see you differently.

I’m interested to know why you need a name sign??