Germany/Canada is an uncommon pairing in the Hetalia fandom. It's often called GerCan, Germanada, and rarely, Maple Wurst.
Even though both characters never interacted in the anime, they interacted once in the webcomic, where Germany asks Canada what is Kumajiro's name and Kumajiro replies "Knut". They also are shipped together due to their relations in real life. Germany and Canada also have a fondness for polar bears and their brothers (Prussia and America respectively) are very loud and are the "troublemakers".