Willem is a distinctive boys' name in United States, ranking #1490 in 2006 with 103 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 123.9%. In 2006, approximately 1 in every 19,953 boys born was named Willem. STABLE Recent data shows the name is currently stable.