Where does “þrahilaz” come from?

þrahilaz (Proto-Germanic) comes from Proto-Indo-European tregʰ-, from Proto-Indo-European dʰregʰ- — to run.

Ancestry of “þrahilaz”, step by step

Step	Language	Word	Meaning
1	Proto-Indo-European	tregʰ-	to drag, pull?; to run, walk
2	Proto-Indo-European	dʰregʰ-	to run

þrahilaz — Etymology, Origin & Word History | Etymology Explorer