The story
From corruption of the French surnames Radisson and Groseilliers.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: The 17th-century pair of French-Canadian explorers Pierre-Esprit Radisson and Médard Chouart des Groseilliers working for the Hudson's Bay Company of English Royal Charter Full definition →
From corruption of the French surnames Radisson and Groseilliers.
Etymology from Wiktionary, CC BY-SA 4.0.