Campaniacum is the etymon inferred from numerous toponyms in France. The Toponymie générale de la France (TGF) derives it from a Roman personal name Campanius and the Gaulish suffix -acum.^[1] The -i- (which is important in the phonetic evolution of *Campaniacum) suggests that Campanius is a gens name.^[2]

The modern forms differ according to the diverse phonetic evolutions of the local dialects.

• Campagnac (TGF § 7029)
• Campénéac (Morbihan) (TGF § 7535)
• Campigny (TGF § 8819)
• Champagnac (TGF § 7061 and § 7438)
• Champagnat (TGF § 7612 and § 8480)
• Champagné (TGF § 8133)
• Champagneux (TGF § 8537)
• Champagney (TGF § 7873)
• Champagny (TGF § 8868)
• Champigny (TGF § 8868)

The initial /ka/ of *Campaniacum became /ʃa/ (written Cha) in most of Gaul, both in langue d’oïl dialects and the northern langue d’oc dialects; but north of the Joret line, and most Langue d’oc dialects (southern one) /ka/ (written Ca-) was preserved.

In the form Champigny, Gaston Zink offered an explanation for the sequence ign in place of the expected agn: before the palatal consonant /ɲ/, the /a/ shifted to /e/, which in turn closed to /i/; Zink points out the parallel form (fungum) campaniolum (‘mushroom’) which became champegneul in Old French and champignon (with substitution of suffix) in modern French.^[3] This shift is restricted to central langue d’oïl.

• Champignac
• Pourceaugnac