In article ,
Cub Driver writes:

Then there famously was Louis Battenberg, who changed his name to
Mountbatten during World War I.

And, of course, the Saxe-Coburg-Gotha, family, who changed their name
to Windsor somewhere around the same time.

Or, as stated in the 4th Blackadder series:
"I can't be a traitor! I'm as British as Queen Victoria!"
"Oh, so you're half German, you married a German, you speak German,
and the Kaiser is your Grandson!"

--
Pete Stickney
A strong conviction that something must be done is the parent of many
bad measures. -- Daniel Webster