2019-5-5 · "Reisen" (レイセン) is in fact not her original name, but is the name she received when she became the Watatsuki sisters' pet. Her original name has not been revealed. The unofficial romaji "Reisen" is used to distinguish the name from reisen (鈴仙), used in Reisen Udongein Inaba's name, through different spelling with identical ...