Where does “łono” come from?

łono (Old Polish) comes from Proto-Slavic lono, from Proto-Indo-European logʰ-s-no-.

Ancestry of “łono”, step by step

Step	Language	Word	Meaning
1	Proto-Slavic	lono
2	Proto-Indo-European	logʰ-s-no-	—

łono — Etymology, Origin & Word History | Etymology Explorer