Alethea is a distinctive girls' name in United States, ranking #3191 in 2017 with 50 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 138.1%. In 2017, approximately 1 in every 34,518 girls born was named Alethea. FALLING Recent data shows the name is currently falling.