Where does “Tarassu” come from?

Tarassu (Ingrian) comes from Russian Тарас, from Ukrainian Тара́с, from Ancient Greek Ταράσιος, from Ancient Greek ταράσσω, from Proto-Indo-European dʰreh₂gʰ- — to irritate; rough.

Ancestry of “Tarassu”, step by step

Step	Language	Word	Meaning
1	Russian	Тарас	a Ukrainian
2	Ukrainian	Тара́с	—
3	Ancient Greek	Ταράσιος	—
4	Ancient Greek	ταράσσω	I disturb; I agitate
5	Proto-Indo-European	dʰreh₂gʰ-	to irritate; rough

Every word from Proto-Indo-European dʰreh₂gʰ- →Every word from Ancient Greek ταράσσω →Every word from Ancient Greek Ταράσιος →