Ivar of Waterford

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. . . Ivar was very likely a grandson of Ragnall ua Ímair, although the precise line of descent is uncertain, and the middle generation, that of the "Imhar, Tanist of the foreigners" slain in a major battle against Ruaidrí ua Canannáin in 950, is only an educated guess made by Todd and followed by Valante.

The names of Ivar's wife or wives are unknown but one was likely the daughter of Donnubán mac Cathail,[22] king of Uí Fidgenti, probably by a daughter or granddaughter of Ivar of Limerick. Another may have been a daughter of an Osraige dynast,[23] possibly Gilla Pátraic mac Donnchada, king of Osraige.

His known descendants were:[24]

   Gilla Pátraic (died 983) - name suggests association with the Osraige as well as Christian identity [25]

   Ragnall (died 995)

   Donndubán (died 996) - an extremely rare name, thus probably a grandson of Donndubán mac Cathail. According to a tradition of uncertain provenance which made itself into the Encyclopædia Britannica for several decades, Donndubán mac Ímair, along with his maternal grandfather Donndubán mac Cathail, is the eponymous ancestor of some of the modern O'Donovan family.[26] Likely no pedigree survives to verify the claim.

   Ragnall mac Ímair, king of Waterford (died 1018) - Ivar's successor

        ? mac Ragnaill (died 1015)

       Ragnall mac Ragnaill, king of Waterford (died 1035)

   Sihtric mac Ímair, king of Waterford (died 1022)

King of Dubllin