First and most especially the single most important factor: b/c I thought it sounded cool. 😎
Second, I googled "what does Zaddy mean" - oh wait that was earlier in the day, cough, I mean I googled "Rudolph the Red-Nosed Reindeer", found that it was first aired in 1939, and so put that.
I would love to see where it would go forward from there, but our puny human minds surely could not handle the Eldritch strangeness that would entail... (or rather, we could only do it once, then go insane forever afterwards - sign me up!:-P)
I thought some of the older ones, like 2000, were more secure, with ability to access on-chip security features. So ofc they threw all that out in favor of 10, the final OS that would come as a subscription service, meaning that you'd never need to buy one again. And then they threw that out too, in favor of the next one... and on and on it goes:-P.