Where does “Grobian” come from?

Grobian (German) comes from Latin grobianus, from German grob, from Old High German grob — coarse.

Grobian (German): brute

Definitions

Step	Language	Word	Meaning
1	Latin	grobianus	—
2	German	grob	coarse, rough; uncouth, rude, crude
3	Old High German	grob	coarse

Grobian — Etymology, Origin & Word History | Etymology Explorer