Diminutive of Kenneth, from Scottish Gaelic 'Coinneach' meaning handsome or born of fire.
Kenny began as a diminutive, most commonly of Kenneth, though it can also shorten other names such as Ken or even, in some communities, McKenna-derived forms. Kenneth itself is an anglicized name with Gaelic roots, linked to the Scottish names Coinneach and Cináed, which are traditionally associated with meanings such as "handsome" and "fire-born." Kenny therefore carries old Celtic and Scottish royal echoes in a much friendlier, more informal package.
Linguistically, that is part of its appeal: it takes something historic and weighty and turns it warm, familiar, and approachable. Unlike many nicknames, Kenny has long been used as an independent given name in its own right. Its cultural life is unusually strong because it has been borne so visibly in modern entertainment and public life, from the singer Kenny Rogers to the jazz guitarist Kenny Burrell, the comedian Kenny Everett, and the long-running animated character Kenny McCormick from South Park.
Those associations have made the name feel genial, accessible, and unmistakably twentieth-century. In English-speaking countries, Kenny often evokes mid-century and late-century popular culture, even when it is newly given. Over time its social perception has shifted a little: it can sound retro in the way names like Tommy or Bobby do, yet that very familiarity has charm. Kenny remains one of those names that bridge formal tradition and everyday warmth, a casual front end attached to a very old and dignified linguistic history.