Depends lol usually the way they do in the anime, Nah-Doo-Toh (cause Japanese R's are pronounced as soft D's...) but sometimes its just Nah-Roo-Toh when I'm lazy
In my head, I read it as 'nar-ew-toe' too, but when I say it out loud, it sounds like 'na-ru-toe...' I blame the dub I used to watch at first for the former aha, it kind of stuck with me.