>changed the name in ww2
Due to rising anti-German sentiment in the UK during World War One, King George V opted to change the name of the Royal House of Saxe-Coburg and Gotha.
The Royal Family website explains: “In 1917, there was a radical change, when George V specifically adopted Windsor, not only as the name of the ‘House’ or dynasty, but also as the surname of his family.
https://www.politicmag.net/politics-news/royal-family-surname-before-windsor-why-did-the-royal-house-change-its-name-royal-news-reports-28146-2020/