From Wiktionary, the free dictionary
From Volscian declune.
Declunus
- Latinized form of a Volscian name possibly referring to the god Declunus
2006, Carl Waldman, Encyclopedia of European peoples[1], New York: Facts On File, →ISBN, page 850:Regarding their religion only an inscription on a votive offering dedicated to the god Declunus, or goddess Decluna, sheds light.