1AgonnayAgonnacum, from AconisLatin, personal name with -acum (indicating ownership)
2AgudelleLatin, acutus (pointed) + ella (diminutive) 
3Aigrefeuille-d'AunisLatin acrifolius (holly) 
4Allas-BocageGaulish personal name Alacius with -acum Alacius his place
5Allas-ChampagneGaulish personal name Alacius +acum 
6AnaisLatin name Annus + acumAnais is a modern corruption
7AndillyGallo-Roman name Andillius + acumFrom Gaulish, Andius
8AngliersLatin angulata (corner) +ariumThe corner of land
9AngoulinsGermanic personal name, Agolenus 
10AnnepontGermanic personal name Anna + Latin pons (bridge)Anna's bridge
11AnnezayLatin name Anitius + acumAnitius his place
12Antezant-la-ChapelleLatin name Anticius + anum 
13ArcesLatin arcus (bridge, arch) 
14ArchiacGermanic name Archo + acumFrom the Latin form of Archo = Archius
15ArchingeayGaulish name Arcantius + acumSite of a spring with a Gallo-Roman basin
16ArdillieresArgilla (clay) + ariaArdile (French dialect form), clay. Salt block manufactury at Chalon, which name comes from salt
17Ars-en-RéLatin arcus (arches) or possibly Basque aritz (oak)The island was ruled by the Basques until the eighth century.
18ArthenacLatin name Artinius ( from bear) + acumArtinius his place
19ArvertAre (by, close to) + vern (alder)The wandering dunes of the peninsula of Arvert are due to the retreat of the ancient forest. At the beginning of the Middle Ages Arvert was an island in the marshes of the Seudre estuary.
20Asnieres-la-GiraudAsinariaDonkey farm
21AujacOccacum, Occius (Gaulish personal name) with -acumOccius’s place
22AulnayAlnedonnacum, Alnedonius (Gallo-Roman personal name), Gallo-Roman cult site at le BureauGallo-Roman graves were found in 1959. A Roman road links Aulnay to Eduts. Fines (boundary) from the Antonine Itinerary.
23AumagneMans (small rural enclosure)Also gives the local name 'maine', Aumagne demonstrates the agglutination of the article.
24Authon-EbeonAuguste + dunonCraftsman’s settlement
25AvyAviacum, Latin name, Avus + -acumAvus his place
26Aytré