Foster is a distinctive boys' name in United States, ranking #1745 in 2008 with 87 recorded births. This places Foster in the top 12% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2025 with 264 births ranking #901. In 2008, approximately 1 in every 23,448 boys born was named Foster. RISING Recent data shows the name is currently rising.