http://northonline.sccd.ctc.edu/chasepl ... anuck..htm
In the 1860's, editorial cartoonists created a character by the name of "Johnny Canuck". Johnny was used to represent Canada, just as Uncle Sam represented the United States. Johnny Canuck was depicted as a wholesome young man, wearing the garb of a habitant, farmer, logger, rancher or soldier. Johnny was often drawn resisting the bullying of Uncle Sam. Boy, we could use someone like that now to keep our NHL teams in Canada.
Johnny had one flaw -- he wasn't too bright. This may explain something. Let's say your best friend comes up to you, pats you on the back and calls you a goof. You laugh it off. On the other hand, if someone you had never met did the same thing, you might take them out back and settle the issue. Maybe that's why Canadians can call themselves Canucks and be proud of it, but don't let those darn Yankees call us Canucks!
During World War II, a new comic book hero was introduced. His name was also Johnny Canuck. This time, Mr. Canuck was a caped strong man who protected Canadians from the Nazi menace. Johnny Canuck had no special powers, but he waged a one man war against Hitler with human strengths belonging to any fine fighting Canuck. Even today, tell someone from Holland that you are a Canuck and they will thank you for liberating their country from the Nazis.
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So, now we have the Canadian image of a Canuck. Powerful (not superhuman but capable). A defender of Canada. A fighter. A tough guy (in spirit and in body). Sounds like a hockey player.
When Vancouver was admitted to the Pacific Coast Hockey League in 1946, they seized upon the image of a team of Canucks. The name worked. Despite the fact that we don't hear much about Johnny Canuck anymore, the term "Canuck" still represents the best qualities of being a Canadian.
http://www.comnet.ca/~dmarchak/candef.htm