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.
Less common today
Kein isn't in the latest US Top 1000. It last peaked at #8,951 in 1990.
US births per 5-year period, 1990βpresent (SSA data).