Willliam is a distinctive boys' name in United States, ranking #6888 in 2006 with 12 recorded births. This places Willliam in the top 49% of ranked US boys' names for the year. Its actual usage is classified as Rare. The name reached its all-time peak in 2006 with 12 births ranking #6888. Since 1996, the popularity has increased by 100.0%. In 2006, approximately 1 in every 171,260 boys born was named Willliam. FALLING Recent data shows the name is currently falling.