Willem is a distinctive boys' name in England & Wales, ranking #1380 in 2015 with 18 recorded births. The name reached its all-time peak in 2008 with 34 births ranking #818. Since 1996, the popularity has increased by 50.0%. In 2015, approximately 1 in every 18,513 boys born was named Willem. FALLING Recent data shows the name is currently falling.