In Irish mythology, Uathach was Scáthach's daughter. According to a legend, Cú Chulainn, who had recently arrived at Scáthach's fortress-home to be her pupil, had a quarrel with Cochar Crufe, Uathach's lover, because Cú Chulainn accidentally broke one of Uathach's fingers. Having been challenged to single combat by Cochar Crufe, Cú Chulainn killed him during the fight. Eventually, Uathach became Cú Chulainn's lover.

In Scottish mythology, Uathach had spurned the advances of Cochar Croibhe, the same character as Cochar Crufe. When she first saw Cú Chulainn, she instantly fell in love with him, and he with her. He was so taken by her beauty, that he forgot his strength and broke her hand. Seeing this, Cochar Croibhe challenged Cú Chulainn to the death, despite Uathach's protests. When Cú Chulainn won the duel, he became Uathach's lover.

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