Alethea is a distinctive girls' name in United States, ranking #2267 in 2021 with 81 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 285.7%. In 2021, approximately 1 in every 20,243 girls born was named Alethea. FALLING Recent data shows the name is currently falling.