This was what I named my Zigzagoon when I was 10. Thought I made it up lol
Of course now I associate it with Ziggy Stardust aka David Bowie in an abstract way as I don't actually know much about the guy... I'm not much keen on his music which I know is odd because he's so popular and the genres of music he made (in particular Glam Rock) are right up my alley but no.
So basically Ziggy gives me images of glam rock and art pop aesthetic, but also Pokemon
I agree with you to use it as a juvenile nickname, though it need not be dropped for those who grew up using it