In a previous verse (2:3), Heigeh’s name is spelled hey, gimel, alef. Here, it is spelled hey, gimel, yud. Perhaps the alef became a yud because there is a difference of nine in gematria (10-1=9), and Heigai is treating nine people differently. Which nine people? Although Esther and her seven maidservants would appear to be eight people, Esther’s other name (Hadassah) is an added personality. Therefore, Heigai had nine new personalities with which to deal.