Where does “مهندس” come from?

مهندس (Classical Persian) comes from Arabic مُهَنْدِس, from Arabic هَنْدَسَة, from Arabic هَنْدَزَة, from Arabic هَنْدَاز, from Middle Persian handʾc-.

Ancestry of “مهندس”, step by step

Step	Language	Word	Meaning
1	Arabic	مُهَنْدِس	—
2	Arabic	هَنْدَسَة	geometry, architecture, engineering; engineering
3	Arabic	هَنْدَزَة	—
4	Arabic	هَنْدَاز	—
5	Middle Persian	handʾc-	—

Every word from Middle Persian handʾc- →Every word from Arabic هَنْدَاز →Every word from Arabic هَنْدَزَة →