Where does “þrēhilaz” come from?

þrēhilaz (Proto-Germanic) comes from Proto-Germanic þreh-, from Proto-Indo-European trāgʰ- — pull, drag, race, run; to pull, drag, race, run.

Ancestry of “þrēhilaz”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	þreh-	—
2	Proto-Indo-European	trāgʰ-	pull, drag, race, run; to pull, drag, race, run

þrēhilaz — Etymology, Origin & Word History | Etymology Explorer