Combination of the letter J and the name Kayla
Jkayla is a modern American invention, likely created by prefixing the popular name Kayla with the initial J. Kayla itself is often considered a derivative of the Hebrew name Kelila, meaning crown of laurel, or a shortened form of Michaela.
Less common today
Jkayla isn't in the latest US Top 1000. It last peaked at #8,640 in 2004.
US births per 5-year period, 1990βpresent (SSA data).