Willem is a distinctive boys' name in United States, ranking #1989 in 2009 with 71 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 54.3%. In 2009, approximately 1 in every 27,934 boys born was named Willem. STABLE Recent data shows the name is currently stable.