Sincere is a distinctive boys' name in United States, ranking #619 in 2013 with 401 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 5,628.6%. In 2013, approximately 1 in every 4,716 boys born was named Sincere. STABLE Recent data shows the name is currently stable.