Íar may be the eponymous ancestor of the
Érainn of Munster. Both the personal name and tribal name derive from the same root.[1] Among his historical descendants, through the later High King
Conaire Cóem, are the
Dál Riata of
Ulster and
Scotland, and the
Corcu Duibne,
Múscraige, and
Corcu Baiscind of Munster. These were known as the
Síl Conairi, one of the principal royal septs of the Érainn.[2]
The brother of Íar was
Dáire mac Dedad, eponymous ancestor of the
Dáirine. He succeeded Íar as king of Munster.[2]