No controvesy as far as I am aware. The British Royal family name was Saxe-Coburg-Gotha.
Needless to say during the First World War as you can imagine there was a degree of anti German feeling in Great Britain so the King George V renounced all all his German titles and adopted the name of Windsor.
Our present Queen Elizabeth does not need or us a surname as such but as she marrried Prince Phillip Mounbatten in 1947 I assume she would be Mrs. Mountbatten in real life.
Therefore her male children would also bear their father's Surname and as Prince William is the Queen's grandson then he too is a Mountbatten.
So Today you saw just another Mr and Mrs Mountbatten getting hitched.