| Gaelic name | Mac Giolla Naoimh — 'son of the servant of the saint' |
| Motto | Consilio non impetu (By counsel, not by force) |
| Territory | Wigtownshire and Galloway |
| Notable for | Hereditary Sheriffs of Galloway; Lochnaw Castle |
The Agnews are one of the oldest landed families of Galloway, the southwestern region of Scotland that historically maintained close ties with Ulster across the narrow North Channel. The name has Norman French origins — d'Agneaux, referring to a place in Normandy — and the family appears in Scottish records from the twelfth century as part of the broader Norman settlement encouraged by the Scottish kings.
The Agnews became Hereditary Sheriffs of Galloway from the fourteenth century, a title they held for four centuries. Their seat was Lochnaw Castle on the Rhinns of Galloway, a position of considerable authority in a region that was often turbulent and resistant to central Scottish rule. The hereditary sheriffship was eventually abolished by Parliament in 1747 as part of the broader abolition of heritable jurisdictions following the Jacobite risings.
The Agnew connection to Ulster is particularly strong and complex. Galloway and the Antrim coast are separated by only thirteen miles at their closest point, and the migration between the two coasts predates the formal Plantation of Ulster in the seventeenth century. Agnews appear in the earliest Antrim records, and by the time of the eighteenth-century migration to North America, Ulster Agnews were among the wave of Scots-Irish settlers who shaped the culture of Appalachia and the American frontier.
In the United States, the most famous bearer of the name is Spiro T. Agnew, Vice President under Richard Nixon — though his family origins were Greek rather than Scottish. The American Agnew genealogy is predominantly Ulster-Scots, concentrated in the mid-Atlantic states and the Carolinas.
Agnew genealogy is productively researched through both Scottish and Irish records. For the Galloway branches, the Dumfries and Galloway Archives in Dumfries hold local records complementing the national database at ScotlandsPeople.gov.uk. Estate papers relating to Lochnaw Castle are held at the National Records of Scotland and provide detailed documentation of the Agnew main line.
For Ulster branches, the Public Record Office of Northern Ireland (PRONI) in Belfast holds estate records, wills, and church registers covering Antrim and Down from the seventeenth century. The Griffith's Valuation (1847–64) provides a comprehensive survey of the Irish Agnews immediately before the Famine emigrations.
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