Alethea is a distinctive girls' name in United States, ranking #3128 in 2019 with 51 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 142.9%. In 2019, approximately 1 in every 32,894 girls born was named Alethea. FALLING Recent data shows the name is currently falling.