Where does “lach” come from?
lach (Venetian) comes from Latin lacus, from New Latin lacrimalis, from Latin lācrima, from Old Latin dacrima, from Proto-Italic *d(r)(k)akrunā, from Proto-Indo-European dáḱru-, from Proto-Indo-European dr̥ḱ-h₂eḱru- — eye bitter.
lach (Venetian): lake
Ancestry of “lach”, step by step