Väinö is a Finnish masculine given name, likely a short form of Väinämöinen, the central hero of the Finnish national epic, the Kalevala. The name Väinämöinen is thought to derive from the Finnish word väinä, meaning "wide and slow-flowing river," reflecting the mythological figure's deep connection to water and the natural world. Väinö thus inherits the cultural and literary weight of its longer counterpart, though it functions as an independent name in modern usage. According to Finnish mythology, Väinämöinen is a wise, ancient magician and the son of the primal goddess Ilmatar, whose name derives from the Finnish word ilma ("air") combined with a feminine suffix. Ilmatar is a semidivine figure who resides in the heavens. The family is connected to Ilmarinen, the immortal smith in the Kalevala who forged the sky and the magical artifact, the Sampo. Väinämöinen's name is the root in the chain, going back through Ilmatar to Ilmarinen. All are key players in the epic cycles.