Where does “kilo” come from?

kilo (Polish) comes from French kilo, from French kilo-, from Ancient Greek χίλιοι, from Proto-Hellenic *kʰehliyoi, from Proto-Indo-European ǵʰéslom, from Proto-Indo-European sm̥-, from Proto-Indo-European sem- — together, one.

kilo (Polish): kilogram; Any other unit whose name starts with...