Modern invented name, likely a variant of Jalen or Dylan.
Jylan is a contemporary American creation without a single ancient etymology. It most likely arose as a phonetic blend, combining the popular 'Jy-' prefix with the '-lan' suffix found in names like Dylan or Jalen. Because of its modern roots, it is often chosen for its unique sound rather than a traditional meaning.
Less common today
Jylan isn't in the latest US Top 1000. It last peaked at #5,567 in 2000.
US births per 5-year period, 1990βpresent (SSA data).