I honestly think he's indifferent to names. Names are a simple title to him because he gave up his own name so long ago to bear a title, so it's all the same to him anymore. But he has developed a liking to Xiaoge, because that's what the important people in his life call him.
Likewise, because names have so little meaning to him, he isn't likely to go putting nicknames to people, or pet names. That's why even Wu Xie is always only Wu Xie. He doesn't think puppy, or brat, or little demon, or naive, but just Wu Xie.
Quiet, strong, rock
"Destined, Zhang, disconnected"
I honestly think he's indifferent to names. Names are a simple title to him because he gave up his own name so long ago to bear a title, so it's all the same to him anymore. But he has developed a liking to Xiaoge, because that's what the important people in his life call him.