Show ContentsMacIllroy History, Family Crest & Coats of Arms

The name MacIllroy has seen many modifications since the time in which it was first devised. In Gaelic it appeared as Mac Giolla Rua, which means son of the red-haired youth.

Early Origins of the MacIllroy family

The surname MacIllroy was first found in County Clare (Irish: An Clár) located on the west coast of Ireland in the province of Munster, where they were the Chiefs of Clonderlaw, conjecturally descended from Tiobraid, son of Iral Glunmhar, King of Ulster. 1

Early History of the MacIllroy family

This web page shows only a small excerpt of our MacIllroy research. Another 148 words (11 lines of text) covering the years 1376, 1638 and 1640 are included under the topic Early MacIllroy History in all our PDF Extended History products and printed products wherever possible.

MacIllroy Spelling Variations

Pronunciation, rather than spelling, was what guided scribes and church officials in recording names, a practice that often led to the misleading result of one person's name being recorded under several different spellings. Numerous spelling variations of the surname MacIllroy are preserved in documents that were examined for evidence of the family's history. The various spellings of MacIllroy included Gilroy, Kilroy, MacGilroy, MacElroy, MacGreevy, Greevy, MacGilrea, McGilroy, McElroy, McGreevy, McGilrea, MacIlrea, McIlrea, Magilroy, Magilrea, MacElry, McElry, MacIlree and many more.

Early Notables of the MacIllroy family

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

Migration of the MacIllroy family

North America received thousands of Irish immigrants from the English-ruled Ireland during the 19th century. Once in the United States or what would become Canada, these immigrants quickly contributed to the ongoing settling and industrialization processes. The largest influx of Irish settlers occurred with Great Potato Famine of the late 1840s. An exhaustive examination of immigrant and passenger lists has shown many early immigrants bearing the surname of MacIllroy: John MacElroy, who landed in Pennsylvania in 1798; and James Gilroy, who settled in Pennsylvania in 1864; they also settled in Massachusetts, New York, and California between 1765 and 1854. The Kilroys also settled in the above states between the same periods. The 1984 edition of the ".



  1. 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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