Question: Are unit names copyrighted?

[Artorius Maximus]

Hello, I'm designing my own board game, which will (may?) cover the time span of Rome: Total War/Europa Barbarorum (except the starting date I design to be is 265 BC).

So that I could avoid ANY and ALL plagiarism, I wanted to run this through you all in the Europa Barbarorum Team first.

Are the unit names copyrighted? I know they are supposed to be authentic names in their native languages, but I'm a little unsure on this.

For instance, let's say I want to use these unit names for my board game:

Lugoae
Sotaroas
Gaesatae
Komatai
Drapanai
Rhomphaiaphoroi
Peltastai
Pedites Extraordinarii

etcetera. . . .

NOTE: I haven't used any of these such unit names yet, at the moment, I'm just using generic names like "Celtic Spearmen," "Scythian Lancers," "Dacian Falxmen," or "Roman Legionary Cohort."

I look forward to receiving an answer from Team members soon. :)

-Artorius Maximus