Pizza Party!!

We watched the Saints/Packers kickoff game last Thursday. I made pizza dough in the bread machine and then we made each added our favorite toppings. Mine is Greek (feta and fresh basil), my son in the middle is Hawaiian (fresh pineapple and Canadian Bacon) and my husband's is pepperoni-palooza!! All topped with black olives. Here it is before going into the oven...

And after....

Question is: Why is Hawaiian pizza called Hawaiian when it has Canadian bacon on it???