Willem is a distinctive boys' name in United States, ranking #1902 in 2011 with 74 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 60.9%. In 2011, approximately 1 in every 25,662 boys born was named Willem. STABLE Recent data shows the name is currently stable.