Alethea is a distinctive girls' name in United States, ranking #4968 in 2012 with 28 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 33.3%. In 2012, approximately 1 in every 62,884 girls born was named Alethea. FALLING Recent data shows the name is currently falling.