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

Irish names tend to vary widely in their spelling and overall form. The original Gaelic form of the name O'Cassedy is Ó Casaide. 1

Early Origins of the O'Cassedy family

The surname O'Cassedy was first found in Fermanagh (Irish: Fear Manach) in the southwestern part of Northern Ireland, Province of Ulster, where the Irish sept claims direct descent from the Irish King Colla da Crioch who was banished from Ireland in 327. 2

Early History of the O'Cassedy family

This web page shows only a small excerpt of our O'Cassedy research. Another 96 words (7 lines of text) covering the years 1143 and 1740 are included under the topic Early O'Cassedy History in all our PDF Extended History products and printed products wherever possible.

O'Cassedy Spelling Variations

Before widespread literacy came to Ireland, a name was often recorded under several different variations during the life of its bearer. Accordingly, numerous spelling variations were revealed in the search for the origin of the name O'Cassedy family name. Variations found include Cassidy, Cassady, Cassiday, Cassedy, Cassedey and others.

Early Notables of the O'Cassedy family

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

Migration of the O'Cassedy family

Thousands of Irish families left for North American shores in the 19th century. These people were searching for a life unencumbered with poverty, hunger, and racial discrimination. Many arrived to eventually find such conditions, but many others simply did not arrive: victims of the diseased, overcrowded ships in which they traveled to the New World. Those who lived to see North American shores were instrumental in the development of the growing nations of Canada and the United States. A thorough examination of passenger and immigration lists has disclosed evidence of many early immigrants of the name O'Cassedy: Patrick Cassidy who settled in Rhode Island, and later moved to Norwich in Connecticut, where he became one of America's first surgeons. Edward, Hugh, James, John, Patrick, Thomas and William Cassady who all arrived in Philadelphia between 1840 and 1865.



The O'Cassedy 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: Frangas non flectes
Motto Translation: Thou may'st break, but shalt not bend me.


  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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