Hathach
From BiblePortal Wikipedia
Hastings' Dictionary of the Bible [1]
Hathach . A eunuch appointed by the king to attend on queen Esther. By his means Esther learned from Mordecai the details of Haman’s plot against the Jews ( Esther 4:5-6; Esther 4:9-10 ).
Holman Bible Dictionary [2]
International Standard Bible Encyclopedia [3]
hā´thak ( התך , hăthākh ; Septuagint Ἁχραθαῖος , Hachrathaı́os ): One of the chamberlains of Ahasuerus , appointed to attend on Esther ( Esther 4:5 , Esther 4:6 , Esther 4:9 , Esther 4:10 , the King James Version "Hatach"), through whom she learned from Mordecai of Haman's plot.