Willem is a distinctive boys' name in United States, ranking #1255 in 2002 with 109 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 137.0%. In 2002, approximately 1 in every 17,812 boys born was named Willem. STABLE Recent data shows the name is currently stable.