Noble, light, or God has answered
Alianah is a modern American elaboration of names like Aliana or Eliana. It likely draws from the Arabic 'Aaliyah' meaning sublime or the Hebrew 'Eliana' meaning God has answered, combined with the popular 'ah' suffix for a softer sound.
Less common today
Alianah isn't in the latest US Top 1000. It last peaked at #3,910 in 2012.
US births per 5-year period, 1990βpresent (SSA data).