Known. A runestone was found under a field in Sweden.
A farmer hit it while ploughing his family farm in Småland, in southern Sweden. The stone is about 2 metres high and 1 metre wide. It dates to the 10th or 11th century, and it lay upside down, with runes on the underside. A runologist read part of them. They say a person raised the stone for a father, the husband of a woman named Ögärd. That woman’s name had not been seen on a runestone before. A cross is carved in the centre.
The page does not say what is still argued.
https://www.ancient-origins.net/news-history-archaeology/runestone-sweden-0014340