I'm all for spelling it at least a little friendlier towards pronunciation. I just can't make my mind sound out TH as S

It reminds me of a conundrum some goof asked a teacher when I was in high school. Wondering if you could name your kid Paul but pronounce it Scott. Despite the background, Aeris's name seems to take the same liberties. If its meant to sound a certain way, why wouldn't someone want to spell it that way?