During the war, Britain and Germany fought, and the British army was defeated, which led to the growing hatred of the British for Germany's war. London was savagely attacked by German bombers, resulting in 162 deaths and hundreds of serious injuries. Britain experienced this disaster and many children were killed. The people in London are very angry, and their anti-German consciousness is particularly high, covering the whole of Britain. Even the shops run by Germans were smashed.
When World War I broke out, the people fiercely opposed Germany and denounced Germany's crimes. This was undoubtedly a signal of great crisis of confidence for the British royal family, and it was necessary to set an example and draw a clear line with Germany. So in order to show his position, George V decided to break off relations with relatives of the same surname in the German royal family. The royal family no longer adopted his grandfather's German surname, but changed his surname to Windsor, which originated from the oldest castle in England, namely Windsor Castle.
George V set out to build a royal brand that is close to the people and loves the people. When he was young, he was an excellent naval officer. After he ascended the throne, he donated all his property to the state and turned it over to the state treasury. During the war, he took good measures to appease the domestic people, unite the United forces of the British people and fight against hostile countries abroad. The last battle ended and they won.
Therefore, in order to consolidate the kingship, gain the support of the people, and for his own country, George V finally named the Windsor Dynasty after Windsor Castle, the largest and oldest castle in Britain.