Claim: Strömsborg is a small islet  in central Stockholm, Sweden named after Strömmen ("The Stream") and the merchant Berge Olofson Ström who bought the island in 1740.
Evidence: Strömsborg (Swedish for '"Stream's castle"') is a small islet in central Stockholm, Sweden, located north of Stadsholmen, and west of Helgeandsholmen, between the bridges Centralbron, a motorway passing through central Stockholm, and Vasabron. The merchant Berge Olofson Ström bought the island in 1740, and, according to a description from 1896 (G. Nordensvan), ten years later he had a stone house ("suitable in size") surrounded by lime trees built on the island.