Willem is a distinctive boys' name in United States, ranking #1325 in 2004 with 112 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 143.5%. In 2004, approximately 1 in every 17,721 boys born was named Willem. STABLE Recent data shows the name is currently stable.