You can find the internal names very easily by opening the 'descr_names' file in the EB data folder. Then just scroll down to the faction you're looking for and there you have it.
The problem with moving Romans is that they have so few first names that the EB staff made many copies of them. So, 'Manivs Cornelivs Scipio' could have an internal name of 'ManivsA Romanvs' or 'ManivsK Romanvs' or ANY OF THE LETTERS IN BETWEEN. There's no way to figure out which copy of Manivs is used except to experiment. Save your game, then pick a nice out of the way location. Try teleporting your Roman to that spot. You probably won't get it on the first try, and you might actually teleport the WRONG Manivs before you get to the right one (hence the testing site). Eventually you should figure out which internal name the character has. Write it down and use it from then on.
Oh, and don't forget that all those fancy Roman cognomina are all given by script. Every Roman character has an internal 'last name' of 'Romanvs'.
Hope this helps...
p.s. Here's the other 'hidden' internal names I've discovered:
-Sweboz: all character have the last name 'der_deutsch'
-Sarmatians: all character have the last name 'steppenwulf' (har har EB)
-Saka: all character have the last name 'saka_soab'
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