Alethea is a distinctive girls' name in United States, ranking #3984 in 2000 with 31 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 47.6%. In 2000, approximately 1 in every 58,580 girls born was named Alethea. FALLING Recent data shows the name is currently falling.