From https://en.wikipedia.org/wiki/Rurik
The only information about Rurik is contained in the 12th-century Primary
Chronicle written by one Nestor, which states that Chuds, Eastern Slavs,
Merias, Veses, and Krivichs "drove the Varangians back beyond the sea, refused
to pay them tribute, and set out to govern themselves". Afterwards the tribes
started fighting each other and decided to invite the Varangians, led by
Rurik, to reestablish order. Rurik came in 860-862 along with his brothers
Sineus and Truvor and a large retinue.
Image of Rurik in the "Tsar's titularnik"
According to the Primary Chronicle, Rurik was one of the Rus', a Varangian
tribe likened by the chronicler to Swedes and Gotlanders. The scholarly
consensus[3] is that the Rus' people originated in what is currently coastal
eastern Sweden around the eighth century and that their name has the same
origin as Roslagen in Sweden (with the older name being Roden).[4][5]
According to the prevalent theory, the name Rus', like the Proto-Finnic 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 it could be linked to the Swedish coastal area of Roslagen
(Rus-law) or Roden, as it was known in earlier times.[6][7] The name Rus'
would then have the same origin as the Finnish and Estonian names for Sweden:
Ruotsi and Rootsi.[7][8] Sineus established himself at Beloozero and Truvor at
the city of Izborsk. Truvor and Sineus died shortly after the establishment of
their territories, and Rurik consolidated these lands into his own territory.
According to the entries in the Radzivil and Hypatian Chronicles[9] under the
years 862-864, Rurik’s first residence was in Ladoga. He later moved his
seat of power to Novgorod, a fort built not far from the source of the Volkhov
River. The meaning of this place name in medieval Russian is 'new
fortification', while the current meaning ('new city') developed later.
Rurik remained in power until his death in 879. On his deathbed, Rurik
bequeathed his realm to Oleg, who belonged to his kin, and entrusted to Oleg's
hands his son Igor, for he was very young. Oleg moved the capital to Kiev (by
murdering the then-rulers and taking the city) and founded the state of Kievan
Rus', which was ruled by Rurik's successors (his son Igor and Igor's
descendants). The state persisted until the Mongol invasion in 1240.
FamilySearch.org has several possible parents of Rurik. Could not find any
other sources for parents.