late 14c., "attendant, watchman," agent noun from wait (v.). Sense of "attendant at a meal, servant who waits at tables" is from late 15c., originally in reference to household servants; in reference to inns, eating houses, etc., it is attested from 1660s.
fem. suffix, from French -esse, from Late Latin -issa, from Greek -issa (cognate with Old English fem. agent suffix -icge); rare in classical Greek but more common later, in diakonissa "deaconess" and other Church terms picked up by Latin.
<a href="https://www.etymonline.com/word/waitress">Etymology of waitress by etymonline</a>
Harper, D. (n.d.). Etymology of waitress. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/waitress