The name Finnhamn is derived from the Finnish boats which called into the harbour on their way to and from Stockholm, and is often now used for the island as well as the harbour. Finnhamn was bought by Stockholm City in 1943.
Finnhamn's origin dates back to the Finnish ships that docked at the harbour on their trips between Stockholm and other destinations, and it is commonly used to refer to both the island and the harbour. The city of Stockholm purchased Finnhamn in 1943.