Willliam is a distinctive boys' name in United States, ranking #11554 in 1999 with 5 recorded births. The name reached its all-time peak in 2006 with 12 births ranking #6888. Since 1996, the popularity has decreased by 16.7%. In 1999, approximately 1 in every 384,017 boys born was named Willliam. FALLING Recent data shows the name is currently falling.