アルスター物語群に登場するアイルランドの英雄クー・フーリン<ref>Porter, ''A Sculpture at Tandragee'', p. 227.</ref>の育ての親であるコナール・セルナッハ(Conall Cernach)の名前にcernの語源を見出そうとする試みがなされている。この解釈では、セルナッハ(Cernachは)「角ばった、勝利した、突出した」という広い意味を持つ蔑称とされるが、コナールとケルヌンノスが関連しているという証拠はほとんどない<ref>John Koch. (2006) Cernunnos [in] ''Celtic Culture: A Historical Encyclopedia'', p. 396. ABC-Clio.</ref>。
8世紀に書かれた「Táin Bó Fraích」(「Fraechへの牛の襲撃」)という物語に登場するConallの短い一節は、Conallが「獣の主人」としての属性を備えていたことの証拠とされている<ref name="Anne Ross 1967">Anne Ross. (1967, 1996). ''Pagan Celtic Britain: Studies in Iconography and Tradition''. Academy Chicago Publishers.</ref>。
A brief passage involving Conall in an eighth-century story entitled ''Táin Bó Fraích'' ("The Cattle Raid on Fraech") has been taken as evidence that Conall bore attributes of a "master of beasts."<ref name="Anne Ross 1967">Anne Ross. (1967, 1996). ''Pagan Celtic Britain: Studies in Iconography and Tradition''. Academy Chicago Publishers.</ref> In this passage Conall Cernach is portrayed as a hero and mighty warrior who assists the protagonist Fraech in rescuing his wife and son, and reclaiming his cattle. The fort that Conall must penetrate is guarded by a mighty serpent. The supposed anti-climax of this tale is when the fearsome serpent, instead of attacking Conall, darts to Conall's waist and girdles him as a belt. Rather than killing the serpent, Conall allows it to live, and then proceeds to attack and rob the fort of its great treasures the serpent previously protected.
The figure of Conall Cernach is not associated with animals or forestry elsewhere; and the epithet "Cernach" has historically been explained as a description of Conall's impenetrable "horn-like" skin which protected him from injury.