|Easton's Bible Dictionary|
Myrtle, the Jewish name of Esther (q.v.), Esther 2:7.
Int. Standard Bible Encyclopedia
ha-das'-a (hadhaqqah, "myrtle"): The Hebrew name (Esther 2:7) formerly borne by ESTHER (which see).
Hadassah (1 Occurrence)
Esther 2:7 He brought up Hadassah, that is, Esther, his uncle's daughter; for she had neither father nor mother. The maiden was fair and beautiful; and when her father and mother were dead, Mordecai took her for his own daughter. (WEB KJV JPS ASV BBE DBY WBS YLT NAS NIV)