03/06/2026
There’s one thing that surprises people when researching their ancestry in Sweden: last names don’t work as expected.
Most Swedes before the 20th century used patronymic — a last name based on the first name of the father. The father’s first name was followed by the word for son (son) or daughter (dotter). The son of Johan had the last name Johan’s son—Johansson. The daughter of Johan’s daughter—Johansdotter.
Examples of common Swedish patronymics are:
• Andersdotter, Andersson
• Johansdotter, Johansson
• Karlsdotter, Karlsson
• Nilsdotter, Nilsson
• Eriksdotter, Ersdotter, Eriksson, Ersson
So in an average Swedish 19th century family, there would have been one last name for the daughters, another for the sons, and one for each parent.
That means you can’t trace your “Johansson line” the way you might in other countries. You won’t find a Facebook group for your Johansson ancestors. People with the same last names weren’t necessarily related, even if they came from the same farm. The father shared a first name, nothing more.
Some Swede used other names than patronymics. So it’s easy to think that they had started using family names. But that’s not necessarily true. Some had personal surnames that were only for them.
You can never assume that a last name was passed on in Sweden.
And for your research, it means adopting slightly different strategies in Sweden than elsewhere. Sweden was a remote country with a unique combination of climate, culture, and regulations that often differed from larger European countries whose history may be more familiar.
Family history research in Sweden is rewarding. Swedish genealogy records are easy to find and access. But as we’ve seen, it comes with its own challenges.
Want to know more about your Swedish ancestors and how to research them? Sign up for my newsletter Exploring Swedish Roots, where I guide you to the specifics of Swedish records and history, so that you can get to know your ancestors.
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