The Japanese imperial family does not have a surname, so how . . . - 知乎 Japanese imperial family members have varying ranks The highest-ranking are the imperial family members of the inner court, which are the children of the Emperor and the Crown Prince Currently, the only one who is still in school is Princess Aiko, the only daughter of Crown Prince Naruhito, who is referred to as "Aiko" in school using her "court title" "Aiko," which stands for her surname