Sadly, it has come to my attention that, while the Finns call themselves "swamp people," we Anglophones do not. I had been led to believe that "Finn" was etymologically related to "fen." But Sam Mikes (found via the update to the Eugene Volokh post he's spinning off of) points out that the prevailing scholarly opinion is that "Finn" is more likely related to "find." This means that, etymologically speaking, Anglophones are referring to a certain group of Scandinavians as "hunter-gatherers" (though they do still presumably hunt and gather in the swamp).