Alethea is a distinctive girls' name in United States, ranking #4360 in 2011 with 33 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 57.1%. In 2011, approximately 1 in every 53,297 girls born was named Alethea. FALLING Recent data shows the name is currently falling.