@AuldWolf where did you get the information about modern and old naming conventions?
In game I see Charrs named one way or the other seemingly withouth rhyme or reason. For example the Night warband, stationed at Bloodsaw mill, all have “Night” as second part of their surname, but the “Faith” warband stationed at Kinar Fort, Blazeridges Steepes put it BEFORE their chosen name.
Night is Iron Legion, Faith is Blood Legion so that might influence on it.