Most of the fish in my tank are named. If I can tell them apart from the others they get a name. I also usually do a theme for each species. I know, I'm strange.
My Ps. Crabros - M-Horatio, F-Esperanza, F-Esmerelda, F-Enid
M. Callainos M-Claudius (he's deformed)
M. Maingano Adult-Winston Churchill, the 4 babies don't have names yet
Ps. Acei - M-Frank Sinatra, F-Audrey Hepburn, F-Marilyn Monroe
My bn plecos are Grizzly Adams and his wife
I can't tell my julies or multies apart yet, but when I can, they'll get names too.