Where does “barbaer” come from?

barbaer (Middle Dutch) comes from Old French barbare, from Latin barbarus, from Ancient Greek βάρβαρος, from Proto-Indo-European balb-.

Ancestry of “barbaer”, step by step

Step	Language	Word	Meaning
1	Old French	barbare	—
2	Latin	barbarus	foreign; savage; uncivilized
3	Ancient Greek	βάρβαρος	non-Greek-speaking, foreign; barbaric, brutal,...
4	Proto-Indo-European	balb-	—