This name derives from the Germanic element “iv”, which in turn derives from the Proto-Germanic “*īhwaz” (yew "tree"). Ivo is the Latinized form of a medieval name of Old French origin, Cognate with modern French Yves. Saint Ivo of Kermartin was a parish priest among the poor of Louannec, the only one of his station to be canonized in the Middle Ages. He is the patron of Brittany, lawyers and abandoned children. His feast day is May 19. Poetically, he is referred to as "Advocate of the Poor". Ivo could also be correlated with the Celtic "Ivo", one of the ancient Celts holy trees.
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