canonical hour, mid-13c., from Old French matines (12c.), from Late Latin matutinas (nominative matutinæ) "morning prayers," originally matutinas vigilias "morning watches," from Latin matutinus "of or in the morning," associated with Matuta, Roman dawn goddess (see manana). Properly a midnight office (occupied by two services, nocturns and lauds) but sometimes celebrated at sunrise. The Old English word was uht-sang, from uhte "daybreak."
<a href="https://www.etymonline.com/word/matin">Etymology of matin by etymonline</a>
Harper, D. (n.d.). Etymology of matin. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/matin