Where does “lagu” come from?

lagu (Old Norse) comes from Old Norse lag, from Proto-Germanic lagą, from Proto-Indo-European legʰ- — to lie.

Ancestry of “lagu”, step by step

StepLanguageWordMeaning
1Old Norselagstratum, layer; due place, right position;...
2Proto-Germaniclagąsituation; law
3Proto-Indo-Europeanlegʰ-to lie
Every word from Proto-Indo-European legʰ- →Every word from Proto-Germanic lagą →Every word from Old Norse lag →