Where does “Кацърков” come from?

Кацърков (Bulgarian) comes from Romanian catâr, from Middle French catarrhe, from Latin catarrhus, from Ancient Greek κατάρροος, from Ancient Greek καταρρέω, from Ancient Greek κᾰτᾰ-, from Ancient Greek κατά, from Ancient Greek καταστερίζω — to be/become dry; to burn, to glow; hearth.

Ancestry of “Кацърков”, step by step

Step	Language	Word	Meaning
1	Romanian	catâr	mule
2	Middle French	catarrhe	—
3	Latin	catarrhus	catarrh, rheum
4	Ancient Greek	κατάρροος	catarrh, head cold
5	Ancient Greek	καταρρέω	flow down; stream, rush; drip
6	Ancient Greek	κᾰτᾰ-	fully; down; denoting motion downwards
7	Ancient Greek	κατά
8	Ancient Greek	καταστερίζω	to place among the stars; I put among the stars
9	Ancient Greek	ἀστήρ	a celestial body; illustrious person; starfish
10	Proto-Hellenic	astḗr	star
11	Proto-Indo-European	h₂stḗr	star
12	Proto-Indo-European	h₂eHs-	to be/become dry; to burn, to glow; hearth

Every word from Proto-Indo-European h₂eHs- →Every word from Proto-Indo-European h₂stḗr →Every word from Proto-Hellenic astḗr →