How to Trace Your Irish Ancestry from America

Irish records are organised by units that overlap and do not nest tidily. Getting these straight saves months.

• Townland — the smallest unit, and the one that matters most. There are roughly 61,000 of them, some only a few dozen acres. Irish records and Irish memory both work in townlands.
• Civil parish — the administrative parish, used for Griffith's Valuation, tithe records and the censuses.
• Catholic parish — a different thing with different boundaries, and the unit the church registers use. A family's civil parish and Catholic parish frequently have different names. This single fact defeats more researchers than anything else.
• Barony — an older grouping of parishes, still used in nineteenth-century records.
• Poor Law Union / Superintendent Registrar's District — the unit civil registration uses from 1864, and again not the same as the parishes.
• County — the one everyone knows, and far too big to be useful on its own.

So when you find "Ballymacarbry", check whether it is a townland, a civil parish or a Catholic parish, because the answer determines which archive to open.

The place name is almost always on this side of the Atlantic. These are where it hides, roughly in order of how often they deliver.

1. Naturalisation papers. Post-1906 files are detailed and frequently give the exact birthplace. Pre-1906 records are thinner but worth checking.
2. The Catholic parish register in America. Baptism and marriage entries were often written by a priest from the same part of Ireland, and sponsors and witnesses are usually relatives or neighbours from the same townland. This is the most under-used source in Irish-American research.
3. Civil War pension files. If an ancestor served, the widow's pension file can be extraordinary — sworn statements from neighbours, marriage evidence, sometimes pages torn from a family Bible, and frequently the Irish parish.
4. Death certificates and obituaries. The obituary in a local or an Irish-American paper often names the county and parish, and the relatives still at home.
5. Gravestones. Irish-American headstones very often name the townland and county outright — "native of the parish of Kilmacthomas, Co. Waterford". Check the surrounding plots too: they were bought by families and by people from the same place.
6. Passenger manifests, searched by given name, age and year rather than by surname. Post-1893 arrivals record last residence and the relative being joined.
7. The earliest census the family appears in, when the name was least anglicised.
8. Fraternal and benevolent society records — the Ancient Order of Hibernians, county associations, burial societies.

Irish surnames were heavily anglicised, and anglicisation merged distinct names as well as respelling them.

Prefixes were dropped under the penal laws and largely restored in the nineteenth century, so an O' tells you about the 1800s rather than the 1000s. Worse, translation happened: Smith in Cavan is usually Mac Gabhann, "son of the smith", translated outright rather than transliterated. The same applies to Ryan, Murphy and half a dozen other very common names formed from more than one Gaelic original.

Search every variant, with and without the prefix, and see our guide to how immigration changed family names for the mechanisms.

The received wisdom is that Irish records burned. The truth is specific, and it matters.

Lost in the destruction of the Public Record Office at the Four Courts in June 1922: most nineteenth-century census returns before 1901, a great many wills and probate records, and a large number of Church of Ireland parish registers.

Survived, and this is the longer list: Catholic parish registers, held by the parishes; civil registration; the Registry of Deeds, from 1708; Griffith's Valuation; the Tithe Applotment Books; the 1901 and 1911 censuses; the Genealogical Office's heraldic records; estate papers in private and county hands.

Irish research is harder than English research. It is not the impossibility it is usually described as.

• The 1901 and 1911 censuses — complete, free, and fully searchable at the National Archives of Ireland. Even if your emigrant left before 1901, the relatives who stayed are in them, and they will give you the townland.
• Catholic parish registers — digitised and free at the National Library of Ireland, browsable by parish. Mostly from the early 1800s, earlier in the towns.
• Civil registration — free at IrishGenealogy.ie. All births, marriages and deaths from 1864, and non-Catholic marriages from 1845, with images.
• Griffith's Valuation (1847–64) — a property survey listing every occupier of land in Ireland by townland. This is the closest thing to a census for the famine and post-famine period, and it is free.
• The Tithe Applotment Books (1823–37) — the equivalent for a generation earlier.
• PRONI, the Public Record Office of Northern Ireland, free and excellent, for the six counties.
• The Registry of Deeds, from 1708, indexed and increasingly accessible — and unusually valuable, because it survived.

Between 1845 and 1852 roughly a million people died and a million emigrated, and Irish emigration continued at high rates for another seventy years. Two consequences for research.

Chain migration. People did not scatter randomly. One person went, sent money, and brought the next — so an Irish townland frequently reappears intact in one American parish, one mining town, one street. If you find where the neighbours came from, you have found where your family came from.

Landlord and workhouse records. Assisted emigration schemes, estate papers and Poor Law Union records document who left and from where, and they survive in county archives and the National Archives.

If your family is Presbyterian, arrived in the eighteenth century, and settled in Pennsylvania, the Carolinas or Appalachia, you are probably tracing Ulster Scots — Lowland Scots planted in Ulster from 1609 who then emigrated in large numbers from the 1710s.

This is a different migration with different records: Presbyterian session minutes rather than Catholic registers, PRONI rather than Dublin, and frequently a Scottish origin behind the Irish one. Surnames like Armstrong, Elliot, Johnston, Graham and Bell are Border Scots names that came through Ulster.

Once you have the family and the place, and not before.

Arms in Ireland, as everywhere, belonged to particular families in particular places, not to everyone sharing a surname. For a name like Murphy or Kelly an armorial lists several distinct coats, because several unrelated families bore the name — which is the correct answer, not a limitation.

Burke's General Armory covers Irish arms by surname, with the family and place attached, and is free. Our guides to Irish heraldry and the fifty most common Irish surnames cover the rest.

The Heritage Volume sets out what the historical record holds for a surname — where it comes from, what it meant in Irish, where its bearers were concentrated, and the arms associated with it. How Your Report Is Made explains which parts come from public records and which our system builds.