Where does “Tecucianu” come from?

Tecucianu (Romanian) comes from Romanian Tecuci, from Bulgarian тека, from Old Church Slavonic тещи, from Proto-Slavic teťi, from Proto-Balto-Slavic tektej, from Proto-Indo-European tekʷ- — to run, to flow.

Ancestry of “Tecucianu”, step by step

Step	Language	Word	Meaning
1	Romanian	Tecuci	a Romanian city
2	Bulgarian	тека	to flow, to run, to gutter; to leak, to ooze, to...
3	Old Church Slavonic	тещи	to flow
4	Proto-Slavic	teťi	to flow, run
5	Proto-Balto-Slavic	tektej	—
6	Proto-Indo-European	tekʷ-	to run, to flow

Every word from Proto-Indo-European tekʷ- →Every word from Proto-Balto-Slavic tektej →Every word from Proto-Slavic teťi →