> Actually, the standard derivation of rus is from the name Rurik,
This derivation is neither standard nor true.
> one of the early Varangian (aka Viking) leaders who traded with
> Kiev.
Not exactly. There was one Hrrekr in the 9th century,
a viking chief in Friesland (mentioned in the Annals
of Fulda) although it is hard to say whether he had
an opportunity to spend even a couple of years
in (what would become) Russia.