Fullerton, Fullarton
Fullerton, Fullarton—These names in Ulster and the West of Scotland are the anglicised forms of M'Cloy and McLoy an Isle of Bute sept; in Gaelic Mac Luaidh.
Alphabetical Index of Anglicised Surnames in Ireland
See also Woulfe’s Irish Names and Surnames
… and O'Hart's Irish Pedigrees