“I thought that Mc is Scottish Mac is Irish”
Other way ‘round.
My great grandmother was a McGill, and her ancestors were from Isle of Skye, Scotland
McNuggets...Big Mac
Hmmm....seems...international.
No, Windy; they mean the same. Mc is just an abbreviation of Mac. I think it became a ‘difference’ due to prejudices in some areas of the US, but it really has nothing to do with Scottish or Irish:
http://www.scottishhistory.com/articles/misc/macvsmc.html