Where does “Corunna” come from?

Corunna comes from Spanish La Coruña, which derives from French Cluny, though the ultimate sense development remains unclear.

Ancestry of “Corunna”, step by step

Step	Language	Word	Meaning
1	Spanish	La Coruña	—
2	French	Cluny	—
3	Irish	cluain	—
4	Old Irish	clúain	—
5	Proto-Italic	klounis	buttock
6	Proto-Indo-European	ḱlównis	buttocks, hip