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Cognomen Ретц (Rets , Raetz , Retts ) , in the world, is quite a rare last name. The last name Ретц is characteristic of Estonia, where it is quite a rare surname, Germany, where it is a rare surname, and Switzerland. Measured by absolute frequency, it most frequently occurs in Germany, the United States, and Russia. Much less frequently, Ретц is the forename as well as the last name.