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Last name Wäinö (Wäinö , Вяйнё ) , all around the world, is an extremely rare surname. Much more prevalently, Wäinö is the forename as well as the last name.
Komi, Kaarto, Kujala, Itkonen, Mäkinen, Lapveteläinen, Andersson, Kovalainen, and Strömberg