Willem is a distinctive boys' name in United States, ranking #2107 in 2015 with 67 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 45.7%. In 2015, approximately 1 in every 28,601 boys born was named Willem. STABLE Recent data shows the name is currently stable.