洁 is not a surename, 小洁 can be a boy's name but it is wired

洁isn't surname ,it is name. 小洁to be a girl,小杰to be a boy.

洁，it can be a surname, u can call someone 小洁, it's ok. It's no mater is boy or girl, u just call someone 小 with surname

You can find all the surename in 百家姓