The only free and comprehensive online etymological dictionary of the Spanish language
lavar (Verb) "to wash"
10th cent. From Latin lavare 'id.' Old Latin lavere. From Proto-Italic *lowa- 'id.' From Proto-Indo-European *lou̯h3- 'id.'
Indo-European
Romance
Portuguese lavar, Galician lavar, Catalan llavar, French laver, Italian lavare, Aromanian lau, Romanian la, Sardinian labare
Italic
Umbrian vutu "he washed"
Celtic
Old Irish lóathar "basin," Breton laouer 'id.'
Germanic
Old Norse lauðr "nitre soap," "lather," Old High German lōdar 'id.,' Old Saxon lōthar 'id.,' Old English lēaþor 'id.' (English lather)
Albanian
Albanian laa "to wash"
Hellenic
Ancient Greek λούειν (loúein) "to wash," Doric λωτρόν (lotrón) "bath"
Armenian
Armenian loganum "to bathe"