Rus' people

The Rus' (Slavic: Русь; Greek: Ῥῶς) were an early medieval group of people who gave their name to the lands of Russia, Ruthenia, and Belarus. According to both contemporary Byzantine and Islamic sources and the Primary Chronicle of Rus', compiled in about A.D 1113, the Rus were Norsemen who had relocated "from over sea", first to northeastern Europe, creating an early polity that finally came under the leadership of Rurik.

Later, Rurik's relative Oleg captured Kiev, founding Rus', academically known as Kievan Rus'. The descendants of Rurik were the ruling dynasty of Rus' (after 862), and of principalities created in the area formerly occupied by Kievan Rus', Galicia-Volhynia Principality (after 1199), Chernigov, Novgorod Republic, Kingdom of Rus (1253–1349), Vladimir-Suzdal, Grand Duchy of Moscow, and the founders of the Tsardom of Russia.

According to the most prevalent theory, the name Rus', like the Finnish name for Sweden (Ruotsi), is derived from an Old Norse term for "the men who row" (rods-) as rowing was the main method of navigating the rivers of Eastern Europe, and that it could be linked to the Swedish coastal area of Roslagen (Rus-law) or Roden, as it was known in earlier times. The name Rus' would then have the same origin as the Finnish and Estonian names for Sweden: Ruotsi and Rootsi.

...
Wikipedia