Where does “catacumbae” come from?

catacumbae (Ecclesiastical Latin) comes from Ancient Greek κατά, from Ancient Greek καταστερίζω, from Ancient Greek ἀστήρ, from Proto-Hellenic astḗr, from Proto-Indo-European h₂stḗr, from Proto-Indo-European h₂eHs- — to be/become dry; to burn, to glow; hearth.

Ancestry of “catacumbae”, step by step

catacumbae traces back through two separate lines of ancestry.

via Ancient Greek κατά

Step	Language	Word	Meaning
1	Ancient Greek	κατά
2	Ancient Greek	καταστερίζω	to place among the stars; I put among the stars
3	Ancient Greek	ἀστήρ	a celestial body; illustrious person; starfish
4	Proto-Hellenic	astḗr	star
5	Proto-Indo-European	h₂stḗr	star
6	Proto-Indo-European	h₂eHs-	to be/become dry; to burn, to glow; hearth

via Latin tumba

Step	Language	Word	Meaning
1	Latin	tumba	tomb
2	Ancient Greek	τύμβος	funeral mound, tomb, grave
3	Proto-Indo-European	tūm-	to grow; to swell, to increase; to swell, be...
4	Proto-Indo-European	tewh₂-	to swell; to crowd; to be strong

Every word from Proto-Indo-European h₂eHs- →