Most of the Scandi countries once used the patronymic system where the fathers or grandfathers name is included in the "last" name. Iceland still does that btw.
Despite the rather obvious pattern here my Swedish best friend is Wichne, my former Swedish housemate is Malmqvist, two of my other Swedish acquaintances are Angborn and Karlkvist. I have also seen a doctor, who is Australian, but of Swedish descent and they're surname is Sandstrom. A surprising lack of 'sons'.
Interesting how while many of these names are common in America, most of them were changed slightly upon immigration to make them more American/English sounding. Two of my ancestors would have been Sven Svensson and Bengt Bengtsson in Sweden, but they became Swen Swenson and Ben Benson in America.
Everyone's is like that. It's also interesting how naming conventions changed. If you meet an American named McSomething, chances are that their family came over from Scotland before the Civil War. If they're named MacSomething, chances are they came over afterwards. It's sadly reflected in the fact that I've met a lot of American black people with a "Mc" last name but never one with a "Mac" last name.
The reason for this is when the Swedish immigrants arrived at Ellis Island, they got registered by only saying their name, and the people writing everything down just guessed on the spelling.
I noticed that there's an odd difference between the answer stats for Jonsson and Jönsson. But this probably simply because Johnson is an alternative spelling of Jonsson, but not of Jönsson.
I did a lot worse than I thought I would. When none of the hockey playing -bergs or -stroms I could think of came up, I was screwed. I used a lot of those.
How old is this? Of those granted citizenship Ali is the 33rd most common surename, add another 2million illegal immigrants and you soon notice it being very much further up the list. source: SCB