Willem is a distinctive boys' name in United States, ranking #1515 in 2007 with 105 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 128.3%. In 2007, approximately 1 in every 19,764 boys born was named Willem. STABLE Recent data shows the name is currently stable.