Change mob names

[UrsuPolar 0]

Hello, I want to change a mob's name, but for some reason the new name is not showing up. I've changed  the name from mob_proto.txt and mob_names.txt and also in npclist.txt, but that did not do anything for the in-game name. If I want to change a npc's name everything works just fine. But no matter what I do, nothing seems to work for the mobs. Is there anything ele I should change beside those  three .txt files?

 

Thanks!