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Cognomen Qingdu (Qingdu ) , in all the world, is an extremely rare surname. Much more prevalently, Qingdu is the forename as well as the last name.
卿笃, 庆堵, 庆度, 庆杜, 庆渡, 庆督, 庆笃, 庆读, 情毒, 清度, 清杜, 清笃, 清读, 青度, 青杜, and 青笃
Wu, Ye, Liu, Han, Xie, Meng, Nong, Zeng, and Huang