Sincere is a distinctive boys' name in United States, ranking #641 in 2011 with 365 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 5,114.3%. In 2011, approximately 1 in every 5,203 boys born was named Sincere. STABLE Recent data shows the name is currently stable.