Billy is a popular boys' name in England & Wales, ranking #82 in 2006 with 825 recorded births. The name reached its all-time peak in 2005 with 955 births ranking #71. In 2006, approximately 1 in every 388 boys born was named Billy. STABLE Recent data shows the name is currently stable.
Billy is the familiar short form of William and carries the inherited meaning usually given as "resolute protector". It feels open, friendly, and much less formal than the full traditional version.
Billy has long been used as both a nickname and a stand-alone given name. It remains especially familiar in Britain and the United States through its mix of informality and tradition.