Uncertain; likely derived from air or Greek origins.
Aerys is a modern name largely popularized by 20th-century fantasy literature. While it lacks a deep historical etymology, it is often associated with the Greek word 'aer' meaning air, or viewed as a creative variation of names like Eris or Ares.
Less common today
Aerys isn't in the latest US Top 1000. It last peaked at #8,799 in 2018.
The 'Mad King' of Westeros Β· A Song of Ice and Fire
A scholarly king of the Seven Kingdoms Β· A Song of Ice and Fire
US births per 5-year period, 1990βpresent (SSA data).