Mostly my kids name them, and like goldmaniac said once a type is named it’s branded forever in my tank. Thankfully this has only happened once, had a 6 line wrasse which was named Zack that vanished away, only to reappear in the QT tank 4 weeks later. It’s like magic to my 4 year old!
-Yellow Tang named, Poon
-Clowns, both get called Nemo
-Hippo Tang, Dory
Foxface, Foxy
Copperband, Copper
Those are the only ones special enough to have received names so it’s about a 60% named, 40 % unnamed.