Duff is a name with English origins, derived from the Old English word "dūf, " meaning "to puff up" or "to swell. " The name has been in use since the Middle Ages and has evolved over time. It is often associated with the surname Duff, which was originally a nickname for someone who was proud or boastful. The use of the name Duff as a given name has become more common in recent years, particularly in the United States.
