Canuck – Wikipedia

“Canuck” / k ə ˈ n ʌ k / is a slang term for a Canadian.The origins of the word are uncertain. The term “Kanuck” is first recorded in 1835 as an Americanism, originally referring to Dutch Canadians or French Canadians.By the 1850s, the spelling with a “C” became predominant. Today, English Canadians and others use “Canuck” as a mostly affectionate term for any Canadian.

https://en.wikipedia.org/wiki/Canuck