Was Harrys surname always Mountbatten-Windsor?

[ssd]

I thought it was just Windsor?

I know the Mountbatten connections, i dont need it explained.

@ssd

Yeah they are more German than anything.

Not any more. Queen Alexandra was Danish. The Queen Mother was Scottish/British. Prince Philip was Danish/Russian and Diana was English. Kate is very English.

So they’ve been getting progressively more British for the last century or so, and Kate and William’s children are of predominantly British blood now.

The population has become more diverse as the royals have become more Anglo-Celtic.

They officially don’t have surnames afaik so they can choose if they want to use one.
Mountbatten - Windsor definitely sounds more fancy then Wales (in my opinion).

Yeah they are more German than anything.

By what definition?

How would any of these sound:

'Agatha Christie was more American than anything'
'Max Mallowan was more Austrian than anything'
'Simon Schama is more Turkish than anything'
'Ben Elton is more German than anything'
'Sadiq Khan is more Bangladeshi than anything'
'Diane Abbott is more Jamaican than anything'
'Mo Farah is more Somali than anything'