Willliam is a distinctive boys' name in United States, ranking #14158 in 2010 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 2010, approximately 1 in every 383,682 boys born was named Willliam. FALLING Recent data shows the name is currently falling.