What are the nicknames named after xx?

Tingting, Yuanyuan, Lili, Jiajia, Yaya, Doudou, Yueyue, Binbin,

Chenchen, Liangliang, Jinjin, Ningning, Nini, Dudu, Yuanyuan, Lele,

Sandy, Lily, Xinxin, Jingjing, Yingying, Yaoyao, Duoduo and Xiaoxiao

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