The only free and comprehensive online etymological dictionary of the Spanish language
quedar (Verb) "to remain," "to stay;" "to meet up"
12th cent. From Latin quietare "to calm." Its definition evolved from the sense of "calm" to "not moving" to "remaining in place." Quietare is a verb formed from the passive participle quietus "peaceful," itself from the verb quiescere "to sleep." From quies "rest" (see quitar) and -escere, an inchoative verb-forming suffix (see -ecer).
Asturian quedar, Portuguese quedar, Galician quedar, Catalan quedar, French quitter, Italian chetare