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Family name Porth (Porta , Portus , 波思 ) , in the entire world, is a common cognomen. The cognomen Porth is habitual in Italy, where it is quite a common surname, Switzerland, and Uruguay (explore the name in all countries). Measured by absolute frequency, it most frequently occurs in Italy, Argentina, and Spain. Much less frequently, Porth is the forename as well as the last name.