The surname Certain was first found in Cork (Irish: Corcaigh) the ancient Kingdom of Deis Muin (Desmond), located on the southwest coast of Ireland in the province of Munster, where they held a family seat as Chiefs of their race. Irish history was greatly influenced by the Norman invasion of 1172, and thereafter, the surnames of Irish Gaelic clanns and septs and many of the Norman families became almost indistinguishable. This family name was found later in Kerry and Limerick. Traditionally they are descended from the O'Connor and from the 3rd son of Fergus Mor, King of Ulster, who was ancestor of the Clann Cruitin.
This web page shows only a small excerpt of our Certain research. Another 91 words (6 lines of text) are included under the topic Early Certain History in all our PDF Extended History products and printed products wherever possible.