Interestingly enough, there was speculation back in the 80’s that Obi Wan was a clone designation, possibly derived from OB1.
I really like this and I don’t know why.
It’s great because it’s open-ended. Was Obi-wan himself a clone? Was he a template for clone forces? Was it a designation given to him by clones, perhaps as a form of endearment? Was it a designation to disguise his prior identity as Ben Kenobi? Was it perhaps his choice of Jedi name once he became a true Jedi much like Darth Vader may have been Anakin’s Jedi name? There’s no knowing which (if any) of these theories is true, and that makes it, like the Clone Wars themselves, a brilliant bit of worldbuilding that ignites the viewer’s imagination.