Fishing for solutions: the place-name Stronsay

Stronsay occurs several times in the various manuscripts containing the Saga of the Earls Orkney (Orkneyinga Saga). The name occurs as Straumsey Streaumsey, Striansey, Striensø, Strionsey, and Strionsø. The last element is ON ey ‘island’, common in Orkney place-names. What then of the first element? In 1915 Magnus Olsen proposed that Norwegian place-names containing the …