Modern invented name, likely a variation of Janiya or Jeremiah
Jerniyah is a contemporary American name with no singular ancient root. It likely emerged as a creative blend of the popular prefix 'Jer-' (found in names like Jeremiah or Jeraldine) and the rhythmic suffix '-iyah', which is common in modern African American naming traditions. It carries a melodic, spiritual quality similar to names like Janiya or Aniyah.
Less common today
Jerniyah isn't in the latest US Top 1000. It last peaked at #11,362 in 2006.
US births per 5-year period, 1990βpresent (SSA data).