Willem is a distinctive boys' name in United States, ranking #1792 in 2010 with 83 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 80.4%. In 2010, approximately 1 in every 23,113 boys born was named Willem. STABLE Recent data shows the name is currently stable.