His name is stavros kaniclius and he was, One of those eugenics fascist types during the wars where Kahn and his kind rose to power, Or maybe it was later with Colonel Green, The Berman era of Trek started to pave over that and now strange new worlds literally retconned it w romulan time travel

But this guy is like oh I'm stufferous connectious the 9th or whatever because he's the 9th clone and it's meant to be a commentary on legacy and like Roman naming conventions where you had rulers with numeric title names