I'm impressed. Varus you're a smart guy. It would be great if these changes are incorporated (subject of course to whether they are possible).

My only comments are (using Varus' numbered paragraphs):

1. Other praenomina, such as Lucius, were also common. Some of the less common ones, such as Quiontus and Sextus, were still far more common than the very rare ones like Kaeso or Statius. It would be possible I suppose to list each praenomen with a percentage likelihood of occurring (again, if that is possible in terms of game mechanics).

2. Agreed, with a couple of minor qualifications. Firstly, although in EB children never seem to die before they reach 16, it was not all that uncommon for children to die in ancient Rome. As a result, the eldest child to reach adulthood may not be the firstborn (if the firstborn died) and therefore would not bear the father's praenomen. Secondly, from recollection (I haven't looked at this in a while) there were some families who didn't name their children after the father, or instead seemed to flip flop back-and-forth between a pair of praenomina. Again, it may be possible to cater for this by giving eldest sons a precentage likelihood of having their father's praenomen. (I would understand if having two FMs with identical names would spoil the game mechanics).

3. Appius was I think a Sabine praenomen, and since the Claudii were the leading Roman family of Sabine heritage they were well known to use it. The wikipedia article on this praenomen is not bad (seems to be well researched with good sources). I agree with Varus that Appius should be reserved for the Claudii.

I agree with everything else Varus says. It would be very cool for us Roman-genealogy-inspired-nerds if these changes were made.