Quick answer: FitzGerald is a Hiberno-Norman surname meaning “son of Gerald,” rendered Mac Gearailt in Irish. The Geraldines became deeply rooted in Ireland after the twelfth-century Anglo-Norman arrival, with major historical branches in Kildare and Desmond.
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Where did the FitzGerald name come from?
The Norman patronymic prefix Fitz means “son of.” Patrick Woulfe lists FitzGerald and Fitzgerald under Mac Gearailt, the Irish-language rendering that developed as the family became part of Irish political and cultural life.
The Kildare Geraldines
The Kildare branch became one of the most powerful families in Leinster. Maynooth Castle was an important stronghold, and the earls of Kildare played major roles in Irish government and politics. Their history gives the surname a lasting association with County Kildare and the Pale.
The Desmond Geraldines
The Desmond branch held extensive influence in Munster. Castles and sites associated with the wider Geraldine story include Askeaton and Desmond Castle at Newcastle West. The Kildare and Desmond histories are distinct chapters within the broader FitzGerald tradition.
FitzGerald, Fitzgerald and Fitz-Gerald
Capitalization and hyphenation vary in modern and historical records. Search FitzGerald, Fitzgerald and Fitz-Gerald, along with Mac Gearailt where Irish-language sources are relevant. Our gifts carry the FitzGerald, Fitzgerald and Fitz-Gerald forms, so every branch of the family finds its own spelling.
Migration and the Irish diaspora
FitzGerald families spread across Ireland and later emigrated to Britain, North America, Australia and elsewhere. Because the name was already widespread before mass emigration, overseas records are most useful when they identify a county, parish, estate, occupation or close relative in Ireland.
How to research FitzGerald ancestors
- Begin with civil births, marriages and deaths at IrishGenealogy.ie.
- Use the 1901 and 1911 censuses to locate households.
- Search every major spelling, including FitzGerald, Fitzgerald and Fitz-Gerald.
- Use parish registers, valuation records, wills and estate collections for the relevant locality.
- Explore the FitzGerald castles guide for place-based historical context.
FitzGerald surname FAQ
Where does the FitzGerald name come from in Ireland?
From Maurice FitzGerald, son of Gerald, constable of Pembroke, who came to Ireland with Strongbow. Woulfe traces every Irish FitzGerald family to him, and in Irish the name became Mac Gearailt.
What are the main historical branches?
Kildare in Leinster and Desmond in Munster are the two best-known Geraldine traditions.
Should the hyphen matter in research?
Search with and without the hyphen, and test matches through names, dates, relatives and places.