I'm pretty sure records from the late 1600s and early 1700s would be in Swedish! As I read about everything you know about Finland and Scandinavia, I realize that I probably should know better some things about Finland, haha. The question about Mongol/Asian blood in Finland, I think there isn't a lot, at least not in a way you would recognize it from the physical appearance! And about that movie "Jade Warrior", I've never seen it, so I don't know what they said about the link between the Kalevala and China, but that link is also something I hear for the first time now, so it's not a normal thing!
Really great talking to you, I learn new things about Finland as well! 😄