Sorta yes sorta no. It's more akin to a title. Literally it means "Those who lose themselves in battle", but formally it refers to Berserker Barbarians. Something being named Katalmach is weird, akin to calling yourself "Blackbeard" or "Goblin Slayer" as your actual name, at least among orcs. Natch, as Katalmach is the name of a rather infamous pirate nowadays, lots of orcs would name themselves Katalmach in an attempt to ape it's reputation, which has mixed results. Most of the time orcs or anyone familiar with the name hears it, expect eyerolls since it usually means someone is trying to seem tougher by using someone else name. Anyone who doesn't know the name by reputation but does know orcish may just think whoever named that orc is weird.