  You know, even nowadays territory of Moscow was Finnish long time ago and has some finnish hydronims on its territory like river jauza.  That's correct. Also name of river Moskva is finnic origin. It probably was 'moska'-joki which is still quite a common name for several rivers and streams. My personal view is also that most people of northern Russia did not come 1000 year ago, but rather are old finnic population who took new language as did finnic people in nowadays Sweden. We in modern Finland (Estonia, Karelia) are only who didn't adopted new language.  22270