Padraig Mac Giolla-Domhnaigh

Loudan—This name was assumed by a branch of the Clan Campbell, and the name in Gaelic would invariably be Mac Cail-lean, i.e., McCallion. In Galloway some branches of those Campbells of Loudour assumed the name of McCambill, families of the name settling in Co. Down in the middle of the 17th century, some of whose descendants went to America about 1760, settling in Ohio and Kentucky, where they yet retain the name of McCampbell, 1922.

Alphabetical Index of Anglicised Surnames in Ireland

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