Sorry but it's not exactly what you think. I don't know where you are getting these informations but they are mixing everything up for you. You've done this many times before. I'm starting to believe you like spaghetti ^_^
Take a look at the Full name of Prince William…. see how long that is and his titles along with it. It was the same with the romans. And if you see repetetif names, well, Julius or Yulius and caius were quiet trendy. They used them a lot, really a lot, and not just for emperors, almost everyone has Yulius or Caius stuck to their LONG name. As for the name Ceaser, it kinda mutated to a word along with time and it started to have the meaning of PRINCE or crown prince in same cases.
I'm glad you are digging, but you are still in the main vein and not looking closely at the events that took place in each region. I'm not saying this is easy, in fact it's very complex and sometimes the meaning of one word differs from one Polis to another during the same era.
it seems i have a lot to tell then. But for now i rather now, i rather wait on Q, i know the team is moving and POTUS is making big steps. I'm glad ^_^
During the battle between Octavius and Marc-A the library of Alexandria was burned down. What did that library contain? Mostly relating an old civilisation?
I hope you will stop following the history you are showing me, i'm sorry i'm making you write too much. there are no double coincidences in the names but more like honorific stuff, trendy stuff, prestige stuff…. some emperors weren't legitimate, so in order to become legitimate they used to mary the ladies of the old reigning family and take the names. It's quiet a complex matter and each case is worth a thesis. As for Constantine, that is a whole different story. i didn't even start with the Byzantine empire, I digging the Seleucides and the Ptolemic dynasties, i'm currently during the war years.