HEFFERNAN

Aongus (or Æneas) Ceannattin, brother of Blad who is No. 92 on the "O'Brien" Pedigree, was the ancestor of O'h-Iffernain; anglicised Hefferan, Heffernan, and Heyfron.

92. Æneas Ceannattin: son of Cass.
93. Conall: his son; had a brother named Baoth ("baoth:" Irish, simple), a quo Booth.
94. Colman: son of Conall.
95. Geimhdealach: his son.
96. Culen (or Ulen): his son.
97. Cathbharr (or Abhartach): his son.
98. Conor (also called Corc): his son.
99. Iffernan ("ifearn:" Irish hell; Lat. "infern-us"): his son; a quo O'h-Iffernain.
100. Faolchadh: his son.
101. Conligan: his son.
102. Sioda: his son.
103. Donoch: his son.
104. Conn: his son.  Some annalists make this Conn the ancestor of Muintir Cuinn or Quin, of Munster.
105. Meil (or Neal): his son.
106. Faolach: his son.
107. Corc: his son.
108. Moroch (or Mortogh) his son.
109. Donoch (2): his son.
110. Giollaseana: his son.
111. Donoch (3): his son.
112. Donall: his son.
113. Thomas: his son.
114. Donall: his son.
115. Donal Oge: his son.
116. Conor O'Heffernan: his son.

REF:
'Irish Pedigrees' by O'Hart, Volume 1, Page 94, dated 1892, reprinted 1989.