In the middle of the surname Gu is the boy's first name Yi.
Gu Yuyou Gu Yiqi Gu Yitong Gu Yi Jie Gu Yi Chao Gu Yi Lun Gu Yi Xuan Gu Yi Gu Chi Yi Yao Gu Yiqiang Gu Wenyi Gu Yi Gu Yuyi Gu Haoyi Chess Gu Yichang Gu Yibo Gu Yisong Gu Yitao Gu Yide Gu Yihua Gu Yicheng Gu Yibai Gu Yinan Gu Yize Gu Yihong Gu Yi Gu Ye Yi Kai Gu Yi Ou Gu Ao Yi Gu Lei Yang Yi Gu Yi Gu Yi Nan Gu Yi Yuan Gu Cai Yi Gu Lin Yi Gu Yi Rui Gu Yi Yu Gu Yi Yu Gu Yicheng Gu Yi Rui Gu Yi Yu Gu Yi Bin. Gu Yi Yuan Gu Yi Gu Yi Long Gu Yi Tian Gu Yi Zhou Gu Yi Gu Yi Gu Yi Sheng Gu Yi Jun Yue Gu Yi Gu Yi Guan Gu Yi Bo Gu Gu Zhao Yi Gu Yi Ning Gu Yi Gu Yi Bang Gu Yi Yuan Gu Yi Gu Yi Gu Yi Feng Gu Yi and Gu Yi Xin Gu Yi Yuan Gu Yi Yun Gu Yi Zhen Gu Yi Wei Gu Yi Zhen Gu Yi Fan Gu Yi Fu Gu Yi Shi Gu Yi Chen.