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In the Dragon Ball universe Son is the family name of Goku, hence the name Son Goku. He inherited the family name from his adoptive Grandpa Son Gohan. It is also derived to the names of his children: Son Gohan (named after his grandpa) and Son Goten (and Probably his grand daughter, Son Pan??!!).
Grade levels in school are generally capitalized if the word “grade” precedes the ordinal number of the grade such as in “Grade 8.” This is also the case when a grade level is used in a title or headline since most words are capitalized.