Do you rename Sims? Particularly non-played Sims?

So far I have not renamed a sim that is already in the game - but I rename sims I add to the game through CAS that have names. I don't have anything against renaming Sims - now-a-days but I still recall in earlier Sims games where that sometimes created problems with sims already in the game so I just don't bother to do it - more so out of habit.

Anything that has ever been an issue in the Sims over the years - I tend to avoid like the plague. LOL.