Sincere is a distinctive boys' name in United States, ranking #648 in 2016 with 408 recorded births. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 5,728.6%. In 2016, approximately 1 in every 4,650 boys born was named Sincere. STABLE Recent data shows the name is currently stable.