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Last name Gerða (Gerða ) , worldwide, is an extremely rare cognomen. Much more prevalently, Gerða is the forename as well as the last name.
Gerda, Gertha, Gjerde, Герда, and גרדה
Jónsdóttir, Sigmarsdóttir, Kristjáns, Halldórsdóttir, and Kristinsdóttir