Alethea is a distinctive girls' name in United States, ranking #3660 in 2003 with 38 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 81.0%. In 2003, approximately 1 in every 48,080 girls born was named Alethea. FALLING Recent data shows the name is currently falling.