Light, torch, or bright one
Alenia is likely a modern elaboration of Elena or Alena, which are derivatives of the Greek name Helen. It carries the same association with radiance and light, often interpreted as a torch or a shining beacon. While rare, it follows the popular trend of melodic, multi-syllabic names ending in -ia.
Less common today
Alenia isn't in the latest US Top 1000. It last peaked at #9,625 in 2025.
US births per 5-year period, 1990βpresent (SSA data).