Willem is a distinctive boys' name in England & Wales, ranking #1104 in 1996 with 12 recorded births. This places Willem in the top 30% of ranked UK boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2008 with 34 births ranking #818. In 1996, approximately 1 in every 26,543 boys born was named Willem. FALLING Recent data shows the name is currently falling.