The House of Windsor came into being in 1917, when the name was adopted as the British Royal Family’s official name by a proclamation of King George V, replacing the historic name of Saxe-Coburg-Gotha. It remains the family name of the current Royal Family.
Technically, both of you are correct.
actually the history of the british monarch is pretty interesting
most of their kings and queens have not been english
the history of english kings and queens on youtube is informative with a touch of humor
Some of the Queen’s children use Mountbatten-Windsor personally.