I like Ja'elle. Not so keen on the spelling of Jayelle as the word 'yell' becomes prominent.
Could you do Jaelle or Jaielle?
I know a girl called Jayley -personally I think it sounds like more of a girl's name, unless you wanted the 1st name to be Jay and 2nd name to be Lee. I like the spelling Jaylie for a girl....

I also like the suggestion of Jayla.

For a boy, what about Jaylan? With Jay for short....