Sinclair is a distinctive boys' name in United States, ranking #9567 in 2021 with 8 recorded births. The name reached its all-time peak in 2025 with 14 births ranking #6400. Since 1996, the popularity has decreased by 33.3%. In 2021, approximately 1 in every 218,530 boys born was named Sinclair. RISING Recent data shows the name is currently rising.