Willliam is a distinctive boys' name in United States, ranking #9067 in 2005 with 8 recorded births. The name reached its all-time peak in 2006 with 12 births ranking #6888. Since 1996, the popularity has increased by 33.3%. In 2005, approximately 1 in every 249,643 boys born was named Willliam. FALLING Recent data shows the name is currently falling.