The only free and comprehensive online etymological dictionary of the Spanish language
-que Conjunction suffix. Latin "and"

From Proto-Italic *-kwe 'id.' From Proto-Indo-European *-kwe 'id.'

Italic: Venetic -kve, Faliscan -cue, Umbrian -p, Oscan -pe

Indo-European: Germanic: Gothic -h; Phrygian: -κε (ke); Balto-Slavic: Old Church Slavonic -kъ; Hellenic: Mycenaean -qe, Doric Greek -κα (ka); Indo-Iranian: Sanskrit -ca, Avestan -ca; Anatolian: Hittite -kku, Palaic -ku, Lydian -k