Alethea is a distinctive girls' name in United States, ranking #2318 in 2022 with 80 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 281.0%. In 2022, approximately 1 in every 20,485 girls born was named Alethea. FALLING Recent data shows the name is currently falling.