Sincere is a distinctive boys' name in United States, ranking #628 in 2015 with 426 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 5,985.7%. In 2015, approximately 1 in every 4,498 boys born was named Sincere. STABLE Recent data shows the name is currently stable.