Alethea is a distinctive girls' name in United States, ranking #2679 in 2020 with 62 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 195.2%. In 2020, approximately 1 in every 26,057 girls born was named Alethea. FALLING Recent data shows the name is currently falling.