McDonalds from Ireland have been in the US since the 17th century (though not the McDonalds restaurant family, at least directly).
And no, you’ve not been filling in gaps you imagine in my knowledge.
Have a good day.
Yes; descended from the Scottish McDonalds, aka Scotch-Irish. If they were Irish from centuries before the Scottish migrations, we would have the O’Donnell’s restaurant franchises. 😏 Take care . . .