Cognate with Latvian kakta (“angle; space between two touching walls”), with further origin outside of Baltic unclear. Buga compares the Baltic terms to Latin conquinīscō (“to crouch down, squat”) (presuming a root form of *kʷeks-), while others have noted similarities to Persian چکاد (čakâd, “top of the head or forehead”) and Proto-Tocharian *kekts'en- (“body”).