Where does “samen” come from?

samen (Old Frisian) comes from Proto-Germanic samanai, from Proto-Indo-European sem- — together, one.

Ancestry of “samen”, step by step

StepLanguageWordMeaning
1Proto-Germanicsamanaiat one; together
2Proto-Indo-Europeansem-together, one
Every word from Proto-Indo-European sem- →Every word from Proto-Germanic samanai →
samen — Etymology, Origin & Word History | Etymology Explorer