Cormac was the son of Donal Glas MacCarthy and Joanna Fitzmaurice. The date and place of his birth have not been found.
Cormac na-Coille MacCarthy Reagh
Donal Glas MacCarthy (-1414)
Donal Glas MacCarthy
Donal Caomh MacCarthy (-1320)
NN de Carewe
Joanna Fitzmaurice