ה אִישׁ יְהוּדִי הָיָה בְּשׁוּשַׁן הַבִּירָה וּשְׁמוֹ מָרְדֳּכַי בֶּן יָאִיר בֶּן–שִׁמְעִי בֶּן–קִישׁ אִישׁ יְמִינִי
5. A Yehudi man was in Shushan the capitol, and his name was Mordechai son of Yair son of Shimi son of Kish, a Yimini man,
Since it would seem redundant to call Mordechai a man, the Midrash (Esther Rabbah 6:2) learns that the verse calls him an “ish” to relate Mordechai to Moshe Rabbeinu because he, too, was called “ish” in the Torah (Bamidbar 12:3). Both were great leaders of the Jews who save their generation, and represent the Oral Tradition that helps guide us through the Written Law. His being called an “ish” was thus a term of respect.