Willem is a distinctive boys' name in United States, ranking #1401 in 2005 with 107 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 132.6%. In 2005, approximately 1 in every 18,665 boys born was named Willem. STABLE Recent data shows the name is currently stable.