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Family name Gunlaug (Gunlaug ) , in the world, is an extremely rare last name. Much more prevalently, Gunlaug is the forename as well as the last name.
Gunlög, and Gunnlaug
Munns, Engen, Kleppe, Wilter, Solbakk, Straume, Skjortnes, Leirvik, Östbye, and Gillesøy