Ulster Scots people
Scotch-Irish is a traditional term for Ulster Scots who later emigrated to what is now the United States;  "Scots-Irish" is a more recent form of the American term, the term has usually been Scotch-Irish in America, as evident in Merriam-Webster dictionaries, where the term Scotch-Irish is recorded from 1744, while Scots-Irish is not recorded until 1972.  and is not to be confused with Irish-Scots, i.e., recent Irish immigrants to Scotland.