Noble or of noble birth
Aleysia is a modern phonetic variant of Alicia or Alisia, which ultimately derives from the Germanic name Adelaide. It carries the historical meaning of nobility and high status, adapted into a contemporary, lyrical spelling.
Less common today
Aleysia isn't in the latest US Top 1000. It last peaked at #7,969 in 2000.
US births per 5-year period, 1990βpresent (SSA data).