Likely a modern diminutive-style form built from Ken- with a light, playful ending.
Kensy traces its lineage most naturally to Mackenzie, a Scottish Gaelic surname meaning "son of Coinneach" — where *Coinneach* (anglicized as Kenneth) derives from the Old Celtic *cainnech*, meaning "handsome" or "fair one." The Mackenzie clan was one of the great Highland families of northwestern Scotland, and the name traveled to North America with Scottish settlers, eventually crossing from surname to given name in the 19th and 20th centuries. By the 1990s, Mackenzie and its short form Kenzie had become widely popular as first names, especially for girls.
Kensy represents the next evolutionary step in that journey — a further trimming and reshaping that gives the name a breezy, modern feel while keeping its Celtic consonant structure intact. It belongs to a broader tradition of -sy and -zie endings that soften strong-rooted names: Daisy, Betsy, Roxy, Mitzy. This suffix pattern has deep roots in English diminutives, originally used as affectionate or familiar forms before emerging as standalone names in their own right.
The name may also draw subtle associations with Kensington, the storied London borough that lent its name to the Duchess of Cambridge's children and carries connotations of refinement and grace. Kensy sits at an interesting crossroads: it feels spontaneous and youthful, yet carries genuine Scottish heritage beneath its contemporary surface — a name that sounds invented but is, in fact, historically grounded.