Show ContentsO'Mulkey History, Family Crest & Coats of Arms

There are multitude of rich histories underlying the many Irish surnames in use today. The name O'Mulkey originally appeared in Gaelic as Ó Maolchathaigh, which means "a descendant of a devotee of St. Cathach." The surname is not, as is often believed, derived from "cathach," meaning "warlike."

Early Origins of the O'Mulkey family

The surname O'Mulkey was first found in County Tipperary (Irish: Thiobraid Árann), established in the 13th century in South-central Ireland, in the province of Munster. 1 They claim descendancy from the Moores, hence the same shield. "John, a younger brother or Roger Caoch who is No. 114 on the 'Moore' pedigree, was the ancestor of Mulcahy." The author continues with a footnote, "From a similarity in the pronunciation of the names, some were of opinion the Maolcaich, who is mentioned in the Stowe Missal, might have been the ancestor of the family. " 2 From these early beginnings, two additional branches were established in Ardpaddeen and in Kilkenny. Of this latter branch, "the ancient fort or rath in the parish of Castleconor, County Sligo known as Rath Maoilcatha, has suggested the idea that this family may have derived their name from the Maolcatha after whom the rath is called; and therefore that they are descended from the royal stock from which branched the O'Connors, Kings of Connaught." 2

Early History of the O'Mulkey family

This web page shows only a small excerpt of our O'Mulkey research. Another 102 words (7 lines of text) are included under the topic Early O'Mulkey History in all our PDF Extended History products and printed products wherever possible.

O'Mulkey Spelling Variations

Many different spelling variations of the surname O'Mulkey were found in the archives researched. These included Scribes and church officials generally spelled a name as it sounded; as a result, a person's name could be spelt innumerable ways in his lifetime. Mulcahey, O'Mulcahey, Mulcahy, O'Mulcahy, Mulcahee, Mulkey, McMulkey and many more.

Early Notables of the O'Mulkey family

More information is included under the topic Early O'Mulkey Notables in all our PDF Extended History products and printed products wherever possible.

Migration of the O'Mulkey family

Ireland, as an English-controlled colony in the 19th century, suffered the loss of hundreds of thousands of its native people. The system of land ownership often did not sufficiently provide for the tenants who farmed the land. This was most clearly evidenced in the Great Potato Famine of the 1840s. Previous years of great demand for grain products and livestock had run the land down. Many landowners foreseeing an upcoming crisis often removed families from the land or forced them to rely on pitifully small plots where only a subsistence living could be made. When the famines of 1845, 46, and 48 hit, many had nothing. Disease and starvation became widespread and families boarded ships for elsewhere any way they could. Those who went to America were instrumental in developing the industrial power known today: many Irish were employed in hard labor positions in factories and in building the bridges, canals, roads, and railways necessary for a strong industrial nation. Research of early immigration and passenger lists has shown that many bearers of the name O'Mulkey: John and Mary Mulcahy settled in Boston in 1849; along with Patrick; David, Denis, John, Thomas, Timothy, William Mulcahy all arrived in Pennsylvania between 1800 and 1860..



  1. MacLysaght, Edward, Irish Families Their Names, Arms and Origins 4th Edition. Dublin: Irish Academic, 1982. Print. (ISBN 0-7165-2364-7)
  2. O'Hart, John, Irish Pedigrees 5th Edition in 2 Volumes. Baltimore: Genealogical Publishing Company, 1976. Print. (ISBN 0-8063-0737-4)


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