Roy - Anglicised Surnames in Ireland

Padraig Mac Giolla-Domhnaigh
1923

Roy—This name is the anglicised form of M'Inroy, a sept of the Clann Donnchaidh in Perthshire; in Gaelic Mac Iain-Ruaidh, meaning the "Son of Red John."

Alphabetical Index of Anglicised Surnames in Ireland

See also Woulfe’s Irish Names and Surnames
and O'Hart's Irish Pedigrees