The only free and comprehensive online etymological dictionary of the Spanish language
leve (Adjective) (weight) "light"
15th cent. From Latin levis 'id.' From Proto-Italic *leχu- 'id.' From Proto-Indo-European *h1legwh-u̯- 'id.' From the root *h1legwh- "to be spry."
Indo-European
Romance
Portuguese leve, Catalan lleu, French liège, Italian lieve
Celtic
Old Irish laigiu "lighter," Middle Welsh llaw "small," Old Breton lau 'id.'
Germanic
Gothic leihts "light," Old Norse léttr 'id.,' Old High German līht 'id.,' Old English līht (English light)
Albanian
Albanian lehtë "light
Balto-Slavic
Old Church Slavonic lьgъkъ "light," Russian lëgkij 'id.,' Slovene lagȃk 'id.,' Lithuanian leñgvas 'id.
Hellenic
Ancient Greek ἐλαχύς (elakhys) "small"
Indo-Iranian
Sanskrit raghú- "fast," Young Avestan rəuuī- 'id.'
Tocharian
B laṅkutse "light"