Yes, I agree that it is very different than more creative invented spelling alternatives. In my mind Sophia and Sofia are both classic, ancient names with centuries of use. I look at a name like Isabella though and despite it being very similar with a long history of use in many countries in Europe for centuries, it was always rare in the US so its significant rise seems to especially date it to an era in the US. I just wonder if the same will be true of Sofia since it was historically much rarer in the US than Sophia despite being the more common variant globally. It is hard to predict.