The word Takara (zai or treasure) used as a name was not so uncommon in the ancient times as it was seen in the names of the imperial princesses of the Emperor Hanzei or the Emperor Ninken, and there was Zai no miko as a son of the Prince Umayado.
宝（財）の名は古代においては反正天皇や仁賢天皇の皇女にその名が見え、また厩戸皇子の子にも財皇子がいたなど、珍しい名前ではない。