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Family name Siki (Siki , シキ , 西基 ) , around the globe, is quite a common cognomen. The cognomen Siki is habitual in Papua New Guinea, where it is quite a rare surname, the Democratic Republic of the Congo, and Japan. Measured by absolute frequency, the name is most common in Japan, Indonesia, and the Democratic Republic of the Congo. Likewise, Siki is the forename as well as the last name.