Alethea is a distinctive girls' name in United States, ranking #5390 in 2006 with 25 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 19.0%. In 2006, approximately 1 in every 76,043 girls born was named Alethea. FALLING Recent data shows the name is currently falling.