Small or slender; also a variant of Cain
Kein is a rare name with dual possibilities. It is often used as a variant of the Irish name Cian, meaning small or slender, or as a spelling variant of the biblical name Cain, meaning acquired or possessed.
Fewer than 5 boys were named Kein in 2025.
US births per 5-year period, 1990–present (SSA data).
