Sincere is a distinctive boys' name in United States, ranking #631 in 2025 with 445 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 6,257.1%. In 2025, approximately 1 in every 3,838 boys born was named Sincere. STABLE Recent data shows the name is currently stable.