Theo is a moderately popular boys' name in United States, ranking #142 in 2021 with 2,703 recorded births. The name reached its all-time peak in 2023 with 4,137 births ranking #78. Since 1996, the popularity has increased by 5,000.0%. In 2021, approximately 1 in every 647 boys born was named Theo. RISING Recent data shows the name is currently rising.