Alethea is a distinctive girls' name in United States, ranking #4833 in 2005 with 27 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 28.6%. In 2005, approximately 1 in every 68,433 girls born was named Alethea. FALLING Recent data shows the name is currently falling.