Modern invention, possibly derived from Jalen or Galen
Jaelen is a contemporary American name, likely a creative spelling of Jalen. Jalen was popularized in the 1990s by basketball star Jalen Rose, whose name was a portmanteau of his parents' names, James and Leonard. Alternatively, it may be influenced by the Greek name Galen, meaning calm.
Less common today
Jaelen isn't in the latest US Top 1000. It last peaked at #1,352 in 2000.
NFL wide receiver
College football wide receiver
US births per 5-year period, 1990βpresent (SSA data).