Where does “binär” come from?

binär (Swedish) comes from French binaire, from Latin bīnārius, from Latin -ārius, from Proto-Italic *-āzios.

Ancestry of “binär”, step by step

Step	Language	Word	Meaning
1	French	binaire	binary; binary file
2	Latin	bīnārius	—
3	Latin	-ārius	—
4	Proto-Italic	*-āzios	—

binär — Etymology, Origin & Word History | Etymology Explorer