Queen Victoria is from the House of Hanover and Prince Albert is from the House of Saxe-Coburg and Gotha. The British royal family changed their house to Windsor during WWI because the House of Saxe-Coburg and Gotha sounded too German.

If you're going by just family ancestry, Charles III is mostly German. Here's me after wasting time on Wikipedia:

Maternal grandfather's grandparents:

https://en.wikipedia.org/wiki/Edward_VII: Anglicized German

https://en.wikipedia.org/wiki/Alexandra_of_Denmark: Danish

https://en.wikipedia.org/wiki/Francis,_Duke_of_Teck: Austrian

https://en.wikipedia.org/wiki/Princess_Mary_Adelaide_of_Cambridge: German

Maternal grandmother's grandparents:

https://en.wikipedia.org/wiki/Claude_Bowes-Lyon,_13th_Earl_of_Strathmore_and_Kinghorne: English

https://en.wikipedia.org/wiki/Frances_Bowes-Lyon,_Countess_of_Strathmore_and_Kinghorne: English

https://en.wikipedia.org/wiki/Charles_Cavendish-Bentinck_(priest): English

https://en.wikipedia.org/wiki/Louisa_Cavendish-Bentinck: English

Paternal grandfather's grandparents:

https://en.wikipedia.org/wiki/Christian_IX_of_Denmark: Danish

https://en.wikipedia.org/wiki/Louise_of_Hesse-Kassel: German

https://en.wikipedia.org/wiki/Grand_Duke_Konstantin_Nikolayevich_of_Russia: Russian Romanov, but he had 3 German grandparents, so his ancestry is mostly German

https://en.wikipedia.org/wiki/Princess_Alexandra_of_Saxe-Altenburg: German

Paternal grandmother's grandparents:

https://en.wikipedia.org/wiki/Prince_Alexander_of_Hesse_and_by_Rhine: German

https://en.wikipedia.org/wiki/Julia,_Princess_of_Battenberg: Pole of German descent

https://en.wikipedia.org/wiki/Louis_IV%252C_Grand_Duke_of_Hesse: German

https://en.wikipedia.org/wiki/Princess_Alice_of_the_United_Kingdom: German