Modern creation, possibly related to James or Semaj
Semajay is a modern American invention, likely created as a rhythmic extension of Semaj (James spelled backward). It follows the trend of adding the '-ay' suffix to established names to create a unique, melodic sound.
Less common today
Semajay isn't in the latest US Top 1000. It last peaked at #7,074 in 2007.
US births per 5-year period, 1990βpresent (SSA data).