Alethea is a distinctive girls' name in United States, ranking #4384 in 2007 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 2007, approximately 1 in every 56,543 girls born was named Alethea. FALLING Recent data shows the name is currently falling.