Willem is a distinctive boys' name in United States, ranking #1542 in 2001 with 79 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 71.7%. In 2001, approximately 1 in every 24,593 boys born was named Willem. STABLE Recent data shows the name is currently stable.