Donahue is the Americanized version of Irish surname Donohoe, which, in turn, is an Anglicized version of the ancient Irish name "Donnchadh" (sometimes "Donncha").
Donncha was a common “first name” in 9th Century Ireland, and when the use of surnames became more common in Ireland around the 10th Century, many people looked to a respected common ancestor to form a surname. The ancestors of the modern Donahues took the name O’Donnchadha, meaning "the son of Donnacha" or "of the line of Donnacha". The modern Donahues are descended from one of at least eight unrelated Donnachas, each of whose descendants adopted the surname O’Donnchadha.
There are eight known O'Donoghue tribal areas in Ireland; in Munster the areas of Tipperary, Cork and Kerry, then there are Kilkenny, Wicklow, Dublin and Meath in Leinster and in Connaught there are Galway, Mayo, Sligo and Cavan. Considerable migration took place over the centuries and family groups took root in many other counties (e.g. Clare, Limerick, Waterford, Roscommon and others), which would today be recognised as their areas of origin.
The Donohoes of the ancient Kingdom of Breifne, centered in modern-day Co. Cavan, are genetically linked to 4th-century Irish warlord Niall of the Nine Hostages.
When the name O’Donnchadha became Anglicized, at least 30 different spellings developed in Ireland, but by the 19th Century the most common spelling was "Donohoe." Of 2,800 families reporting variations of the name at the time of Griffith’s Valuation (1847-1864), 2,483, or 88%, were listed as “Donohoe.” None were listed as “Donahue.” The name distribution geographically during this same period reflects that there were significant clusters of Donohoes found in various parts of Ireland, including County Cavan, County Cork, County Galway, and County Kerry.
The name Donahue may refer to one of several people:
- Ann Donahue (born 1955), American television writer
- Art Donahue (1913-1942), American pilot who flew for the Royal Air Force during the Battle of Britain
- Cornelius Donahue (1850–1878), American Old West outlaw
- Edward Donahue, American college sports coach
- Elinor Donahue (born 1937), American actress
- Heather Donahue (born 1974), American actress
- Jack Donahue (1804–1830), Australian outlaw
- Jack Donahue (born 1944), Louisiana politician and philanthropist
- Jed Donahue, American competitive eater
- Jerry Donahue (born 1946), American guitarist
- Jiggs Donahue, American baseball player
- Jim Donahue (1862–1935), American baseball player
- John Donahue, American baseball player
- John F. "Jack" Donahue, American founder of Federated Investors
- Jonathan Donahue, American rock guitarist
- Joseph Donahue (born 1954), American poet
- Lisa Donahue (born 1976), American reality TV contestant and actress
- Mike Donahue (1871–1960), American athlete and football coach
- Pat Donahue, American baseball player
- Patty Donahue (1956–1996), American New Wave singer
- Phil Donahue (born 1935), American talk show host
- Red Donahue (Francis Rostell "Red" Donahue, 1873–1913), American baseball player
- Sam Donahue (1918-1974), American saxophonist
- Terry Donahue (born 1925), Canadian female professional baseball player
- Terry Donahue (born 1944), American college football coach
- Thomas R. Donahue (born 1928), American organized labor activist
- Tim Donahue (1870-1902), American baseball player
- Timothy Donahue, American executive
- Troy Donahue (1936–2001), American actor
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