I don't understand how any variation of this name has become common at all. It's not a particularly common name. And maybe it looks good on paper but when people say it out loud, does it really matter? No one will know then, will they?
I don't understand why parents take perfectly fine names and mangle them into horrible spellings. It doesn't make any difference whether it spelled Haileagh or not, Hayley is still going to be Hayley no matter how bad it's mangled.