Where does “þiāna” come from?

þiāna (Old Swedish) comes from Old Norse þjóna, from Proto-Germanic þewanōną, from Proto-Indo-European tekʷ- — to run, to flow.

Ancestry of “þiāna”, step by step

þiāna traces back through two separate lines of ancestry.

via Old Norse þjóna

StepLanguageWordMeaning
1Old Norseþjónato serve
2Proto-Germanicþewanōnąto serve
3Proto-Indo-Europeantekʷ-to run, to flow

via Old Norse þéna

StepLanguageWordMeaning
1Old Norseþénato serve
Every word from Proto-Indo-European tekʷ- →Every word from Proto-Germanic þewanōną →Every word from Old Norse þjóna →