OK, so the names files are three, and they are thus (just sections of each file posted so you can get the hang of the syntax):
Names (this file basically gives the screen values of the internal names, the INTERNAL names are in brackets)
{Amulius} Amulius
{Augustus} Augustus
{Aulus} Aulus
{Caius} Caius
{Cassius} Cassius
{Cnaeus} Cnaeus
{Cornelius} Cornelius
{Decius} Decius
{Flavius} Flavius
{Gaius} Gaius
{Galerius} Galerius
{Gnaeus} Gnaeus
{Julianus} Julianus
{Kaeso} Kaeso
{Lentulus} Lentulus
{Luca} Luca
{Lucius} Lucius
{Manius} Manius
{Marcus} Marcus
{Nero} Nero
{Numerius} Numerius
{Oppius} Oppius
{Placus} Placus
{Publius} Publius
{Quintis} Quintis
{Quintus} Quintus
{Secundus} Secundus
{Servius} Servius
{Sextus} Sextus
{Sextius} Sextius
{Spurius} Spurius
{Tertius} Tertius
And so on.
Names lookup (This lists all the internal name values)
Amulius
Augustus
Aulus
Caius
Cassius
Cnaeus
Cornelius
Decius
Flavius
Gaius
Galerius
Gnaeus
Julianus
Kaeso
Lentulus
Luca
Lucius
Manius
Marcus
Nero
Numerius
Oppius
Placus
Publius
Quintis
Quintus
Secundus
Servius
Sextus
Sextius
Spurius
Tertius
Names descr (This gives particular names to particular factions, using the INTERNAL names. Each faction has an entry like this.)
faction: romans_julii
characters
Caspian
Florian
Rilian
Tirian
Octesian
Glozelle
Sopespian
Miraz
Bern
Rhoop
Mavramorn
Revilian
Argoz
Restimar
Alamar
Fulinar
Revilamar
Bernimorn
Suraz
Bernaz
Mirilan
Drinian
surnames
Acilius
Aelius
Aemilius
Afranius
Agricola
Albinus
Alfenius
Alienus
Ammianus
Ammonius
Annaeus
Annius
women
Prunaprismia
Julinia
Sara
Ourlice
Caspina
Renia
Qualmine
Sarapphine
The faction internal names are kept from RTW (I think they're changeable, but it would take forever and confer no benefit).
So the mapping is thus (the below are the correct/exact internal names):
thrace => The Entente
romans_julii => Sainsbury's Pact
romans_scipii => The Backs Alliance
romans_brutii => The Western Treaty
macedon => The Republic
greek_cities => The Hill Confederacy
There's no real rhyme or reason to this and I might shift things round later if we get to a stage where we want to take advantage of culture differences in city plans etc, but I'll take responsibility for crossing that rubicon as/when we get there.