Alethea is a distinctive girls' name in United States, ranking #4667 in 2018 with 29 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 38.1%. In 2018, approximately 1 in every 58,635 girls born was named Alethea. FALLING Recent data shows the name is currently falling.