Alethea is a distinctive girls' name in United States, ranking #3788 in 2001 with 34 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 61.9%. In 2001, approximately 1 in every 52,958 girls born was named Alethea. FALLING Recent data shows the name is currently falling.