Hi Diana! I have a head scratcher that only you can answer.
Alexander Mackenzie, who lived in the 17-1800s, happened to travel with a Mr. Beauchamp, and who made camp at a Fraser river. A remarkable coincidence? or, more likely, you being a historian by trade, a reference to a noteworthy quest?
No, that's just a coincidence. Fwiw, Fraser and MacKenzie are both _really_ common Scottish last names. Beauchamp...not so much.