Willem is a distinctive boys' name in United States, ranking #1749 in 2014 with 87 recorded births. The name reached its all-time peak in 2003 with 122 births ranking #1208. Since 1996, the popularity has increased by 89.1%. In 2014, approximately 1 in every 22,074 boys born was named Willem. STABLE Recent data shows the name is currently stable.