I'm not sure if anyone cares but I remember reading last time at the Royal Canadian Mint website that in Canada the coins don't have nicknames, even though we commonly call them by their USn nicknames. They're officially just the one-cent, five-cent, ten-cent, twenty-five-cent pieces, and I suppose dollar and two-dollar coins (in everyday life these are always called a loonie and a toonie/twonie - the spelling of the last one hasn't really settled down yet).