I’m wondering if anyone can tell me if there is a reason why a Scottish family (McKay) in the 19th century might have the Mc spelling as opposed to the Mac spelling. I read once somewhere - I forget where - that this signified a person having taken the King’s oath, possibly related to military service. I never saw this repeated anywhere else, and my suspicion is that spelling differences meant little or nothing at that time and place — while in the States, anti-Irish, anti-Catholic sentiment might cause discrimination against a person with the Mc spelling, leading some Scots (including my ancestors) to change it. Thanks!