https://knowyourmeme.com/memes/events/donald-trumps-2020-axios-on-hbo-interview

Doesn’t Iceland still follow the tradition of using the father’s first name followed by “son” or “dottir” for their “last names”?

So, when a Jonson meets a Jonsdottir at a singles bar, they just know that they both have fathers named Jon (hopefully not the same one).