Where does “brachygraphie” come from?

brachygraphie (French) comes from Ancient Greek βραχύς, from Proto-Indo-European mréǵʰus, from Proto-Indo-European mreǵʰ- — short.

Ancestry of “brachygraphie”, step by step

Step	Language	Word	Meaning
1	Ancient Greek	βραχύς	short, brief; short, small, little; few
2	Proto-Indo-European	mréǵʰus	short; brief
3	Proto-Indo-European	mreǵʰ-	short

brachygraphie — Etymology, Origin & Word History | Etymology Explorer