Alethea is a distinctive girls' name in United States, ranking #4376 in 1997 with 24 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 14.3%. In 1997, approximately 1 in every 72,527 girls born was named Alethea. FALLING Recent data shows the name is currently falling.