Eógan mac Néill was born on an unknown date to Niall of the Nine Hostages (-c450) and Mongfind and died 465 of unspecified causes.
Children
| Name | Birth | Death | Joined with |
| Murireadhach | |||
Siblings
| Name | Birth | Death | Joined with |
| Lóegaire mac Néill (-c462) | |||
| Conall Gulban (-c464) | |||
| Endae | |||
| Eógan mac Néill (-465) | 465 | ||
| Conall Cremthainne (-480) | |||
| Coirpre mac Néill | |||
| Maine of Tethba | |||
| Fiachu mac Néill | |||