Sincere is a distinctive boys' name in United States, ranking #620 in 2014 with 428 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 6,014.3%. In 2014, approximately 1 in every 4,487 boys born was named Sincere. STABLE Recent data shows the name is currently stable.