Anti-German sentiment
The British Royal family retained the German surname Saxe-Coburg-Gotha until 1917 when, in response to the Anti-German sentiment of World War I, it was legally changed to the English-sounding 'Windsor'. Reigning King George V famously relinquished all his titles he held in Germany and the Titles Deprivation Act 1917 deprived three British princes (two from the House of Hanover and one from the House of Saxe-Coburg and Gotha) of their titles. Even today, the Royal family is sometimes parodied as being 'German'.