As for Aisha being a different name than Ayesha, maybe to Arabic speaking people. But African Americans have all sorts of phonetic and unique spellings for various personal names-some which make sense given the pronunciation of the name, and some , imo, are over the top. {meaning, a bit too much}.
But in cultures where the elements of a word don't mean any specific thing {unlike Hebrew for instance where "el" signifies God], and there is little regard for what a name means, changing the spelling of a name is a creative act.