Willem is a distinctive boys' name in United States, ranking #1723 in 2013 with 86 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 87.0%. In 2013, approximately 1 in every 21,991 boys born was named Willem. STABLE Recent data shows the name is currently stable.