Probably of foreign origin; Hathak, a Persian eunuch -- Hatach.
Englishman's Concordance
Hatach=“verily” 1) a eunuch in the court of Ahasuerus Part of Speech: noun proper masculine A Related Word by BDB/Strong’s Number: probably of foreign origin
Brown-Driver-Briggs
הֲתָךְproper name, masculinea Persian official at court of AhasuerusEsther 4:5,6,9,10.
Esther 4:5 HEB:וַתִּקְרָא֩ אֶסְתֵּ֨ר לַהֲתָ֜ךְ מִסָּרִיסֵ֤י הַמֶּ֙לֶךְ֙ NAS: summoned Hathach from the king's KJV: Esther for Hatach, [one] of the king's INT: summoned Esther Hathach eunuchs the king's
Esther 4:6 HEB: וַיֵּצֵ֥א הֲתָ֖ךְ אֶֽל־ מָרְדֳּכָ֑י NAS:So Hathach went out to Mordecai KJV:So Hatach went forth to Mordecai INT: went Hathach to Mordecai
Esther 4:9 HEB: וַיָּב֖וֹא הֲתָ֑ךְ וַיַּגֵּ֣ד לְאֶסְתֵּ֔ר NAS:Hathach came back and related KJV:And Hatach came and told INT: came Hathach and related to Esther
Esther 4:10 HEB:וַתֹּ֤אמֶר אֶסְתֵּר֙ לַהֲתָ֔ךְ וַתְּצַוֵּ֖הוּ אֶֽל־ NAS: spoke to Hathach and ordered KJV: spake unto Hatach, and gave him commandment INT: spoke Esther to Hathach and ordered to