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The Costallow surname came to Ireland with the Anglo- Norman invasion of the 12th century. They were originally from the Norman family Nangles, or de Angulos, and descended in Ireland from Gilbert de Nangle. Costello and associated variations come from the personal name of a son of Gilbert, Oisdealbhach, whose name consists of the elements "os," which means "deer or fawn", and "dealbhadh," which means "in the form of" or "resembling." The Gaelic form of the surname Costallow, which predated the Anglicized version of the name, is Mac Oisdealbhaigh. This is the earliest recorded example of a Norman family assuming a Mac surname. The prefix O has sometimes been erroneously assumed.

Early Origins of the Costallow family


The surname Costallow was first found in County Mayo (Irish: Maigh Eo) located on the West coast of the Republic of Ireland in the province of Connacht, where they were granted lands by the Earl of Pembroke in the Anglo- Norman invasion of 1172.

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Early History of the Costallow family

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Early History of the Costallow family


This web page shows only a small excerpt of our Costallow research.
Another 275 words (20 lines of text) covering the years 1172, 1500, 1803 and 1865 are included under the topic Early Costallow History in all our PDF Extended History products and printed products wherever possible.

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Costallow Spelling Variations

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Costallow Spelling Variations


It was found during an investigation of the origins of the name Costallow that church officials and medieval scribes often spelled the name as it sounded. This practice lead to a single person's being documented under many spelling variations. The name Costallow has existed in the various shapes: Costello, MacCostello, Costillo, Costallo, Kostello, McCostello, Caustello, Costellow and many more.

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Early Notables of the Costallow family (pre 1700)

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Early Notables of the Costallow family (pre 1700)


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

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Migration of the Costallow family to the New World and Oceana

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Migration of the Costallow family to the New World and Oceana


In the 1840s, Ireland experienced a mass exodus to North America due to the Great Potato Famine. These families wanted to escape from hunger and disease that was ravaging their homeland. With the promise of work, freedom and land overseas, the Irish looked upon British North America and the United States as a means of hope and prosperity. Those that survived the journey were able to achieve this through much hard work and perseverance. Early immigration and passenger lists revealed many bearing the name Costallow: Honor Costello who landed in America in 1756; Bernard, Cornelius, Edward, Hugh, J.B. James, John, John B. Lawrence, Mark, Michael, Neal, Patrick, Peter, Philip, Thomas, Timothy, and William Costello, all landed in Philadelphia, Pennsylvania between 1833 and 1874.

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The Costallow Motto

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The Costallow Motto


The motto was originally a war cry or slogan. Mottoes first began to be shown with arms in the 14th and 15th centuries, but were not in general use until the 17th century. Thus the oldest coats of arms generally do not include a motto. Mottoes seldom form part of the grant of arms: Under most heraldic authorities, a motto is an optional component of the coat of arms, and can be added to or changed at will; many families have chosen not to display a motto.

Motto: Ne te quaesiveris extra
Motto Translation: Seek nothing beyond your sphere.


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Costallow Family Crest Products

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Costallow Family Crest Products



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