« Reply #1 on: Monday 09 December 24 15:17 GMT (UK) »
Somebody will probably arrive later on and do a better description that me but here goes:-
The Highlands of Scotland have "Clans", where all the members are related to each other.
The major clans have "Septs" where. I believe, the septs usually have an early ancestor with DNA of a major clan, or in ancient times a group asked a larger clan to protect them and thus those people with that surname became a Sept of a larger clan..
Have a look down this webpage, which shows the relationship of Grant with Gregor (Mc or Mac means "son of")
_https://clangregorsocietyglc.org/page-18104
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