Light or shining one
Leniya is a modern American coinage, likely a creative variant of names like Laniyah or Alaniya. It is often associated with the Greek root 'helene', meaning light or torch, or the Arabic 'layl', meaning night, depending on the intended phonetic inspiration.
Less common today
Leniya isn't in the latest US Top 1000. It last peaked at #7,289 in 2009.
US births per 5-year period, 1990βpresent (SSA data).