Sinclair is a distinctive boys' name in United States, ranking #11365 in 1999 with 5 recorded births. The name reached its all-time peak in 2025 with 14 births ranking #6400. Since 1996, the popularity has decreased by 58.3%. In 1999, approximately 1 in every 384,017 boys born was named Sinclair. RISING Recent data shows the name is currently rising.