What is the most common Canadian last name?

The most common last name in Canada is Smith.

According to data from Lists of most common surnames in North American countries - Wikipedia, the surname Smith is the most prevalent in Canada, with a significant lead over other surnames. Here is a table showing the top 4 most common surnames in Canada and their associated numbers:

As you can see, Smith is significantly more common than any other last name on the list. While names like Brown, Tremblay, and Martin are also very common, Smith stands out as the most frequently occurring surname in Canada.