Thea is a moderately popular girls' name in United States, ranking #353 in 2025 with 867 recorded births. The name reached its all-time peak in 2018 with 1,208 births ranking #273. Since 1996, the popularity has increased by 793.8%. In 2025, approximately 1 in every 1,854 girls born was named Thea. FALLING Recent data shows the name is currently falling.