Meaning of Keri. Irish name. In Irish, the name Keri means-dusky, dark.The name Keri originated as an Irish name. The name Keri is a unisex name and can be used for a boy or girl name (male or female).Irish Name Meaning-dusky, dark.eaning of Keri. Irish name. In Irish, the name Keri means-dusky, dark.The name Keri originated as an Irish name. The name Keri is a unisex name and can be used for a boy or girl name (male or female). Irish Name Meaning-dusky, dark. Origin-Ireland.