« Reply #2 on: Sunday 27 July 25 01:11 BST (UK) »
One of my ancestors born 1854 came to the UK from the European mainland, which at that time was divided up into small Princedoms/principalities, Kingdoms and States. I too was seeing Karl and Carl until I eventually discovered that my ancestor lived in the British "Kingdom of Hanover" where the given name was written the English way with a "C" = Carl and not the Germanic/Russian/Slavic spelling of "Karl".
I often used the familysearch website to view the map showing the dispersal of surnames around the world. I see the website has changed but it might be useful to you.
https://www.familysearch.org/en/surnameHe arrive d in England in 1864 when he was 10 years 1 day old. died in 1942.
He married an English wife, who in those days was a "chattel" and owned by the husband, thus she too was termed the same nationality as the husband which was "German". So during WWI whilst his three sons served in the English army (!) he had to report to the police station every day. When he retired aged 65 he moved into the countryside and again during WWII he had to report to the local police station. The last days of his life, the local police visited him in his home and the police report stated he couldn't remember the name of his mother.
Aberdeen: Findlay-Shirras,McCarthy: MidLothian: Mason,Telford,Darling,Cruikshanks,Bennett,Sime, Bell: Lanarks:Crum, Brown, MacKenzie,Cameron, Glen, Millar; Ross: Urray:Mackenzie: Moray: Findlay; Marshall/Marischell: Perthshire: Brown Ferguson: Wales: McCarthy, Thomas: England: Almond, Askin, Dodson, Well(es). Harrison, Maw, McCarthy, Munford, Pye, Shearing, Smith, Smythe, Speight, Strike, Wallis/Wallace, Ward, Wells;Germany: Flamme,Ehlers, Bielstein, Germer, Mohlm, Reupke