To be honest, the last ethnically English King of England was HHarold Godwinson, who was killed in action in 1066 against William the Conqueror, the first ruler of Norman origin.
BTW: am Iallowed to refer to the esteemed Mr. Reily as a “Scheißami” next time? ;-)
In 1917, the name of the British royal house was changed from the German Saxe-Coburg and Gotha to the English Windsor because of anti-German sentiment in the United Kingdom during the First World War.