Theodore is an extremely popular boys' name in United States, ranking #4 in 2025 with 13,355 recorded births. The name reached its all-time peak in 2025 with 13,355 births ranking #4. Since 1996, the popularity has increased by 1,375.7%. In 2025, approximately 1 in every 128 boys born was named Theodore. RISING Recent data shows the name is currently rising.