The only free and comprehensive online etymological dictionary of the Spanish language
vencer (Verb) "to conquer"
12th cent. From Latin vincere 'id.' From Proto-Italic *wink- "to tie." From Proto-Indo-European *u̯i-n-k- 'id.'
Indo-European
Romance
Portuguese vencer, Catalan vèncer, French vaincre, Italian vincere, Aromanian azvingu, Romanian învinge, Sardinian bínchere
Celtic
Old Irish fichid "to battle," Middle Welsh gweith "battle," Old Breton gueth 'id.'
Germanic
Gothic weihan "to fight," Old Norse vega 'id.,' Old High German wīgan 'id.,' Old English wīgan 'id.'
Balto-Slavic
Lithuanian veĩkti "to work," Latvian vīkstu "to work"
Hellenic
Ancient Greek εἴκω (eíko) "I am like"
Indo-Iranian
Sanskrit viviktás "both embrace," Middle Persian winj̆- "to contain"