Where does “thionōn” come from?

thionōn (Old High German) comes from Proto-Germanic þewanōną, from Proto-Indo-European tekʷ- — to run, to flow.

Ancestry of “thionōn”, step by step

StepLanguageWordMeaning
1Proto-Germanicþewanōnąto serve
2Proto-Indo-Europeantekʷ-to run, to flow
Every word from Proto-Indo-European tekʷ- →Every word from Proto-Germanic þewanōną →