It's in very frequent use: If you add together Sophie/Sophia/Sofia, it's been the top name for some time.
Does that bother you?
Because remember the number of baby girls given the 'top' name is about half the number it was a few of decades ago, and that also needs to be set against a much larger population.
Also, remember that if you choose a name knowing there'll be a few others around, you won't really notice if you meet one. If you choose an unusual name, and Sod's law means there is another one on the next street (who will end up going to same clubs, same school etc) you may have a different reaction.