I love !! nozomu xD or Nomu idk which one is his name

His first name is Nozomu and last name (family name) is Hinataze.

Toki calls him Noomu because he wants to feel special and thinks its a cutsy nickname. Can't remember if others use it but if so its just cuz the nickname caught on, and everyone in the manga is gay so they like his cutsy nickname I guess