YffiniacYffiniac is a commune in the Côtes-d'Armor department of Brittany in northwestern France.WWW yffiniac.bzhPopulationInhabitants of Yffiniac are called yffiniacais.Personalities is a writer and was born in Yffiniac. Bernard Hinault, cyclist, was born in Yffiniac in 1954., cyclist, lived in Yffiniac.