Adam Clarke, on Esth 2:7

“And he had brought up his brother’s daughter Edissa, who by another name was called Esther: now she had lost both her parents: and was exceeding fair and beautiful. And her father and mother being dead, Mardochai adopted her for his daughter.”

“He brought up Hadassah - הדשה hadassah signifies a myrtle in Chaldee: this was probably her first or Babylonish name. When she came to the Persian court, she was called Esther, aster, or sitara, which signifies a star in Persian: the name is undoubtedly Persian. Esther was the daughter of Abihail, the uncle of Mordecai, and therefore must have been Mordecai's cousin, though the Vulgate and Josephus make her Mordecai's niece: but it is safest here to follow the Hebrew.”

Imported from an open dataset — not yet checked against the printed edition.