Sincere is a distinctive boys' name in United States, ranking #769 in 2002 with 225 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 3,114.3%. In 2002, approximately 1 in every 8,629 boys born was named Sincere. STABLE Recent data shows the name is currently stable.