They were officially designated 'Iroquois' as the US Army preferred to name the helicopter models after Native American tribes. e.g. Cheyenne, Apache, Blackhawk. Notable exception was the Cobra. Growing up on US Army bases, I knew they were Iroquois but no one I knew ever called them that except for some military nerds (like me I suppose). We always called them Hueys, which I think derived from the UH model type designation.