

Wikipedia says from Portuguese, through Persian, back to Sanskrit, being the grand daddy of English, calling it “cina”, and/or it has to do with Qin Dynasty that unified China.
Probably better than whatever bullshit they would have gotten from Zhongguo if “Peking” was as good as they could do with “Beijing”
Tortoises are turtles, but not all turtles are tortoises. Same with toads being frogs.