Cú Coigriche (also Cuchogry) means "hound [or hero] of the neighbouring [or foreign] land."

[citation needed] His father was Tuathal Buidhe Ó Duibhgeannáin, of Castlefore, County Leitrim.

[1] His family, the clan Uí Dhuibhgeannáin, were professional historians[1] from Annaly, many of whom had crossed the Shannon and practised their art in Connacht.

Here the Ó Duibhgeannains set up a bardic college at Kilronan, near Lough Key in northern County Roscommon.

In that year Ó Cléirigh was sent from his mother house at Leuven to Ireland to collect Irish literary, historical and chronological material in danger of being lost.