Just ask the public security bureau to change it. Everyone has a chance to change their name before going to school. Even before going to school, the neighborhood Committee went to my house to determine the name of my future school. I haven't used this name before, that's when I changed it. It is difficult to change after school unless there is a "just" reason.
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In addition, the eight-character relationship you mentioned is mainly "using the name", which has nothing to do with "household name", as long as you use the name frequently.