Alpín mac Echdach may refer to two persons, or to one, or to none. The first person is a presumed king of Dál Riata in the late 730s. The second is the father of Cináed mac Ailpín. The name Alpín is taken to be a Pictish one, derived from the Anglo-Saxon name Ælfwine; Alpín's patronymic means son of Eochaid or son of Eochu.
See more at Wikipedia.org...