Alethea is a distinctive girls' name in United States, ranking #3771 in 2015 with 40 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 90.5%. In 2015, approximately 1 in every 44,616 girls born was named Alethea. FALLING Recent data shows the name is currently falling.