because after the island was first settled it was referred to as La Ville Marie (the city of Mary), however in the decades thereafter the settlers named the mountain on the island Mont Royale (Mount Royal), hence referring to Nouveau France (New France) soon after as Mont Royale or Montreal the second oldest city in North America after Quebec city.
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because it comes from the name webrootabute Please ignore this first answer the correct reason is because since the natives were the first ones to live there they named it kebec