Which monarch adopted the family name "Windsor"?

George V (George Frederick Ernest Albert; 3 June 1865 – 20 January 1936) was King of the United Kingdom and the British Dominions, and Emperor of India, from 6 May 1910 until his death in 1936.

Born during the reign of his grandmother Queen Victoria, George was third in the line of succession behind his father, Prince Albert Edward, and his own elder brother, Prince Albert Victor. From 1877 to 1891, George served in the Royal Navy, until the unexpected death of his elder brother in early 1892 put him directly in line for the throne. On the death of his grandmother in 1901, George's father ascended the throne as Edward VII, and George was created Prince of Wales.

George became the first monarch of the House of Windsor, which he renamed from the House of Saxe-Coburg and Gotha as a result of anti-German public sentiment. In 1924 he appointed the first Labour ministry and in 1931 the Statute of Westminster recognised the dominions of the Empire as separate, independent states within the Commonwealth of Nations.