Princess Alice, Countess of Athlone
When the British Royal Family abandoned all German titles by Letters Patent issued by King George V in June 1917, Prince Alexander of Teck gave up the title "Prince of Teck" in the Kingdom of Württemberg and the style Serene Highness, and took the surname Cambridge,.  For a short time he was known as Sir Alexander Cambridge, then the Earl of Athlone.  Their two surviving children also lost their Württemberg princely titles.