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Cassidy & Variant Sp

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About us

Cassidy - Ó Cassidy - Ó Caiside is an ancient Irish name. There are many Cassidy variations, including Cassity, Cassedy and Casada.

All Cassidys are believed to have originated from the northern area of Ireland, now known as County Fermanagh, Northern Ireland. For centuries they were prominent in the arts and fields of medicine and religion. Like other professional families, over time they moved out to other parts of Ulster province and all of Ireland.

The origin of Ui Caiside, the Cassidys, remains unknown. There is a dispute as to whether they belonged to the Fir Manaigh, the first Celtic settlers of County Fermanagh, or migrated to the area in the sixth century A.D. during the time of St. Molaise who founded the monastery at Devenish Island. Ui Caiside was closely linked to the monastery and had access to its school at a time when education was denied to most.

Any male with the name CASSIDY or any of its variants is encouraged to participate in the Y-DNA study.

This will establish a DNA database so that genealogists and historians can begin to delineate the various CASSIDY branches and discover which, if any, they fall into.

The Y-DNA project encourages participants to be tested at the highest number of markers that they can afford, 37, 67, 111 markers or the Big Y. Please go to the FTDNA homepage to order or upgrade your kit - https://www.familytreedna.com/

We also have a Family Finder project for those with other CASSIDY patriarchs or matriarchs not on the direct male line (membership conditions apply).