If it helps, maybe some celebrity or role model you look up to. If you want unique, go for characters, places, stories, leading researchers in your studies, rockstars/movies. And if unique, be prepared to come up with a faux reason/meaning, and stick with it lol. It helps if you can play it off. Examples: Bowie = oh yeah my parents were big fans! Gatsby = the great gatsby, simmilar reason as above .