From Proto-Slavic*lьgъkъ, from a pre-Slavic *h₁ln̥gʷʰ-u-ko, ultimately from Proto-Indo-European*h₁lengʷʰ-(“light”). Cognates include Sanskrit लघु(laghú), Ancient Greek ἐλαφρός(elaphrós) and ἐλαχύς(elakhús), Latin levis and Old English lēoht (English light).