Where does “kílógramm” come from?

kílógramm (Icelandic) comes from Icelandic kíló-, 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.

kílógramm (Icelandic): kilogram