Modern invented name, likely a combination of Jay and Hayley.
Jaley is a contemporary American creation without a single ancient root. It most likely functions as a portmanteau of the bird-inspired name Jay and the Old English name Hayley, which means hay meadow. It follows the popular trend of 'ley' ending names for girls.
Less common today
Jaley isn't in the latest US Top 1000. It last peaked at #4,532 in 2003.
US births per 5-year period, 1990βpresent (SSA data).