proper noun/ɡin.fɔʁ/
a 13th-century French greyhound that received local veneration as a folk saint; an Italian saint from Pavia
“Alor les paysans du voisinage, émus de cette histoire, rendirent a saint Guinefort, chien et martyr, des honneurs divins.” — So the peasants from the neighborhood, moved by this story, rendered divine honors to Saint Guinefort, dog and martyr.
Possibly from Breton; guen + frout.