Where does “νήχω” come from?

νήχω (Ancient Greek) comes from Proto-Indo-European (s)neh₂- — to swim; to float.

Ancestry of “νήχω”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	(s)neh₂-	to swim; to float

νήχω — Etymology, Origin & Word History | Etymology Explorer