Willem is a distinctive boys' name in United States, ranking #1814 in 2012 with 82 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 78.3%. In 2012, approximately 1 in every 23,130 boys born was named Willem. STABLE Recent data shows the name is currently stable.