Where does “рудоволосий” come from?

рудоволосий (Ukrainian) comes from Ukrainian рудий, from Old East Slavic рудъ, from Proto-Slavic rudъ, from Proto-Balto-Slavic roudos, from Proto-Indo-European h₁rowdʰ-o-, from Proto-Indo-European h₁rewdʰ- — red.

рудоволосий (Ukrainian): red-haired, redheaded, ginger-haired

Definitions

red-haired, redheaded, ginger-haired

Ancestry of “рудоволосий”, step by step

рудоволосий traces back through two separate lines of ancestry.

via Ukrainian рудий

Step	Language	Word	Meaning
1	Ukrainian	рудий	redhead
2	Old East Slavic	рудъ	—
3	Proto-Slavic	rudъ	red, blood red, reddish; ginger; brown
4	Proto-Balto-Slavic	roudos	—
5	Proto-Indo-European	h₁rowdʰ-o-	—
6	Proto-Indo-European	h₁rewdʰ-	red

via Ukrainian волос

Step	Language	Word	Meaning
1	Ukrainian	волос	a hair
2	Proto-Slavic	vȏlsъ	hair pigmented filament

Every word from Proto-Indo-European h₁rewdʰ- →Every word from Proto-Indo-European h₁rowdʰ-o- →Every word from Proto-Balto-Slavic roudos →