Basically, what sorts of men would have been the rulers and top generals of this faction. If it's exclusively without any exceptions at all only Armenians, and if no men other than Armenians would have ever been included in this number even if they started expanding and building an empire, then we just need Armenian ethnicities exclusively. If we can include (rarely, very rarely, extremely rarely, whatever) other non Armenians, then it's ok to have them also. But even if we only did Armenians, we could I suspect include regional variations: men from the bigger cities in one place, vs. more rural men who rose through the ranks of the army, vs. men from the eastern coasts of Armenia vs. whatever.