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The Song dynasty book (960–1279) "Hundred Family Surnames" lists the most common Chinese surnames. I would pick from one of the top ten most common, but I would not use the most common because that would be like using John Smith as a pseudonym. https://en.wikipedia.org/wiki/Hundred_Family_Surnames

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For the first name, he might choose a name that doesn't exactly reflect who he is but is close enough to not seem unlikely. He wouldn't want a name that seems royal, but, if anything in his manners or appearance suggests that he is from a slightly higher station, then he might want a name that makes sense for his assumed station. I'm not familiar with the naming conventions during that era, but maybe something like Qing, Shui, or Yun would be okay?