Absolutely not. Granted, my country is right next to Italy, but I've only ever heard about spaghetti with ketchup on the internet, from people from other countries.
I grew up with a lot of Italian cooking and when I first went to Japan I saw a small pile of spaghetti in one of the bento lunch boxes covered with what I thought was marinara sauce. When I ate it and it turned out to be ketchup I almost spit it on the floor in shock.