Where does “ēristboran” come from?

ēristboran (Old High German) comes from Proto-Germanic airist, from Proto-Germanic airi, from Proto-Germanic airiz — earlier, before; comparative degree of *airi.

Ancestry of “ēristboran”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	airist	earliest, at first; superlative degree of *airi
2	Proto-Germanic	airi	early
3	Proto-Germanic	airiz	earlier, before; comparative degree of *airi

Every word from Proto-Germanic airiz →