The continental ancestry could reflect Norman origins.

The Normans were themselves descended from Viking settlers in what is now northern France who had been there for a century before the Conquest.

Norman DNA would have had both Scandinavian and Frankish components.

The continental ancestry could reflect Scandinavian origins, someone who was part of the long tradition of Scandinavian movement into and through the Humber region, which had been ongoing since the Viking Age of the ninth and tenth centuries.

The continental ancestry could reflect Flemish or German connections.