A male given name from Scottish Gaelic, originally used in Scotland, popular in all English-speaking countries in the 20th century.
"Kenneth is a common male given name that has been widely used across English-speaking countries since the 1900s."
Kenneth is an Anglicized version of the Old Irish name Cináed, which was originally a Pictish word meaning "handsome." This name traveled into English through its association with Scottish kings and saints like Cainnech before becoming common as a surname such as Mackenzie.