Nauruans are a nation and an ethnic group indigenous to the Pacific island country of Nauru. They are most likely a blend of Micronesian, Melanesian and Polynesian ancestry.
The origin of the Nauruan people has not yet been finally determined. It was probably seafaring or shipwrecked Polynesians or Melanesians, who established themselves there because there was not already an indigenous population present, whereas the Micronesians were already crossed with the Melanesians in this area.
The Micronesians or Micronesian peoples are various closely related ethnic groups native to Micronesia, a region of Oceania in the Pacific Ocean. They are a part of the Austronesian ethnolinguistic group, which has an Urheimat in Taiwan.
Ethno-linguistic groups classified as Micronesian include the Carolinians (Northern Mariana Islands), Chamorros (Guam & Northern Mariana Islands), Chuukese, Mortlockese, Namonuito, Paafang, Puluwat and Pollapese (Chuuk), I-Kiribati (Kiribati), Kosraeans (Kosrae), Marshallese (Marshall Islands), Nauruans (Nauru), Palauan, Sonsorolese, and Hatohobei (Palau), Pohnpeians, Pingelapese, Ngatikese, Mwokilese (Pohnpei), and Yapese, Ulithian, Woleian, Satawalese (Yap).