Walter Wardop Sr. gave the town the name, Lac du Bonnet on October 1, 1900. Wardrop was an early entrepreneur in the area and also Lac Du Bonnet's first postmaster. He called the new post office Lac du Bonnet. The name originated from the large "bonnet like" shape of a lake 5 miles downstream from the town's original site. A name first used by Pierre Gaultier de Varennes, sieur de La Vérendrye in the 1700's.