Where does “Yushchenko” come from?

Yushchenko is a Ukrainian surname of unclear origin, possibly derived from a Ukrainian diminutive suffix -enko attached to an unknown root.

Ancestry of “Yushchenko”, step by step

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