Where does “ærligr” come from?

ærligr (Old Norse) comes from Middle Low German erlich, from Old High German ērlīh, from Proto-Germanic *aiʀulīk.

Ancestry of “ærligr”, step by step

Step	Language	Word	Meaning
1	Middle Low German	erlich	—
2	Old High German	ērlīh	—
3	Proto-Germanic	*aiʀulīk	—

ærligr — Etymology, Origin & Word History | Etymology Explorer