Alethea is a distinctive girls' name in United States, ranking #5386 in 2009 with 26 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 23.8%. In 2009, approximately 1 in every 70,649 girls born was named Alethea. FALLING Recent data shows the name is currently falling.