Alethea is a distinctive girls' name in United States, ranking #3030 in 2025 with 54 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 157.1%. In 2025, approximately 1 in every 29,764 girls born was named Alethea. FALLING Recent data shows the name is currently falling.