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Family name Kidney (Nere
, Kidney
, Kidni
) , throughout the world, is quite a common last name. The last name Kidney is characteristic of Ireland, where it is quite a common surname, Trinidad and Tobago, where it is quite a rare surname, and Papua New Guinea. In absolute terms, it is commonest in India, the United States, and Brazil. Likewise, Kidney is the forename as well as the last name.