Alethea is a distinctive girls' name in United States, ranking #4107 in 2014 with 36 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 71.4%. In 2014, approximately 1 in every 49,609 girls born was named Alethea. FALLING Recent data shows the name is currently falling.