Alethea is a distinctive girls' name in United States, ranking #4094 in 2004 with 34 recorded births. The name reached its all-time peak in 2021 with 81 births ranking #2267. Since 1996, the popularity has increased by 61.9%. In 2004, approximately 1 in every 54,004 girls born was named Alethea. FALLING Recent data shows the name is currently falling.