Sincere is a distinctive boys' name in United States, ranking #6542 in 1997 with 9 recorded births. This places Sincere in the bottom 40% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2022 with 545 births ranking #544. Since 1996, the popularity has increased by 28.6%. In 1997, approximately 1 in every 209,454 boys born was named Sincere. STABLE Recent data shows the name is currently stable.