Grand-Champ is a commune in the Morbihan department of Brittany in north-western France. Inhabitants of Grand-Champ are called Gréga…Grand-Champ is a commune in the Morbihan department of Brittany in north-western France. Inhabitants of Grand-Champ are called Grégamistes in French. Grand-Champ counted 5,404 inhabitants in 2017, an increase of 14% compared to 2007.