Sincere is a distinctive boys' name in United States, ranking #603 in 2021 with 461 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 6,485.7%. In 2021, approximately 1 in every 3,792 boys born was named Sincere. FALLING Recent data shows the name is currently falling.