Billy is a diminutive form of William, which originated from Germanic tribes such as the Franks and Anglo-Saxons. It's derived from the Old German word 'willihelm', meaning 'resolute protector'.
The name Billy has been adopted in various cultures, including British and American English, with no specific cultural or religious significance.
People named Billy are often seen as cheerful, adaptable, and confident with a youthful energy.
The name Billy remains popular, particularly in informal settings like childhood nicknames or affectionate terms.