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Family name Niangi (Niangi ) , in all the world, is a rare cognomen. The surname Niangi is characteristic of the Democratic Republic of the Congo, where it is a rare surname, France, where it is a very rare surname, and the United Kingdom, where it is an extremely rare surname. Measured by absolute frequency, the name is most common in the Democratic Republic of the Congo, France, and India. Very seldom, Niangi is the forename as well as the last name.