It was called PowerMac before they put PowerPC chips in. They probably could've kept the name with Intel processors if they wanted to.
No, before the PowerPC chips came along, there were LC, Performas, and Quadras. Granted there were still PowerPC based Performas after the switch, there were no non-PowerPC based PowerMacs.
PowerMac = PowerPC inside.
Perhaps you meant PowerBook. There were lots of PowerBooks before PowerPC came along...