I wouldn't mind knowing how that got started myself.
My mom had a piano student named Kelye (pronounced the same as
Kelly), and later when we got a new puppy we named her Kelye, also.
I think the "ye" ending looks nice on some names, makes them a little more feminine. The spelling Kelly/Kelley seems masculine to me, since I have an uncle named
Kelley.
Just hopefully the "ye" ending doesn't become overused and too trendy.