Alethea is a distinctive girls' name in United States, ranking #4634 in 2002 with 26 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 23.8%. In 2002, approximately 1 in every 69,108 girls born was named Alethea. FALLING Recent data shows the name is currently falling.