Where does “erre” come from?

erre (Middle Dutch) comes from Old Dutch irri, from Proto-Germanic irzijaz, from Proto-Indo-European h₁ers- — to flow.

Ancestry of “erre”, step by step

Step	Language	Word	Meaning
1	Old Dutch	irri	—
2	Proto-Germanic	irzijaz	bewildered, crazy, confused, lost; erring, wrong,...
3	Proto-Indo-European	h₁ers-	to flow

erre — Etymology, Origin & Word History | Etymology Explorer