Where does “distich” come from?

Distich comes from Latin distichon, from Ancient Greek δίστιχον, from the adjective δίστιχος meaning "of two rows," combining δι- "two" with στείχω "to go or arrange in rows," ultimately from Proto-Indo-European steygʰ-.

distich (English): A couplet, a two-line stanza making complete...