In the pasuk (Vayikra 13:2), sefaria translates:
אָדָ֗ם כִּֽי־יִהְיֶ֤ה בְעוֹר־בְּשָׂרוֹ֙ שְׂאֵ֤ת אֽוֹ־סַפַּ֙חַת֙ א֣וֹ בַהֶ֔רֶת וְהָיָ֥ה בְעוֹר־בְּשָׂר֖וֹ לְנֶ֣גַע צָרָ֑עַת וְהוּבָא֙ אֶל־אַהֲרֹ֣ן הַכֹּהֵ֔ן א֛וֹ אֶל־אַחַ֥ד מִבָּנָ֖יו הַכֹּהֲנִֽים׃ When a person has on the skin of his body a swelling, a rash, or a discoloration, and it develops into a scaly affection on the skin of his body, it shall be reported to Aaron the priest or to one of his sons, the priests.
The Haamek Davar explains that the title of "אדם" denotes importance, quoting an unspecified Zohar and Medrash saying: "דאדם משמעו חשוב".
Where does the Zohar or Medrash mention אדם as being considered important? (It would be helpful if an explanation can be offered as to why אדם specifically is considered important as well.)