| Ffurf safonol | Ffurf safonol arall | Ffurf Saesneg | Math | Cyfeirnod grid | Awdurdod lleol | OS Open Names |
|---|---|---|---|---|---|---|
| Abaty Cwm-hir | ... | Abbey Cwm-hir | Anheddiad | SO0571 | Powys | Open OS Open Name link |
| Aberaeron | ... | Aberaeron | Anheddiad | SN4562 | Ceredigion | Open OS Open Name link |
| Aberafan | ... | Aberafan | Anheddiad | SS7590 | Castell-nedd Port Talbot | Open OS Open Name link |
| Aberaman | ... | Aberaman | Anheddiad | SO0101 | Rhondda Cynon Taf | Open OS Open Name link |
| Aberangell | ... | Aberangell | Anheddiad | SH8410 | Gwynedd | Open OS Open Name link |
| Aberarad | ... | Aberarad | Anheddiad | SN3140 | Sir Gaerfyrddin | Open OS Open Name link |
| Aber-arth | ... | Aber-arth | Anheddiad | SN4763 | Ceredigion | Open OS Open Name link |
| Aber-bach | ... | Little Haven | Anheddiad | SM8512 | Sir Benfro | Open OS Open Name link |
| Aber-banc | ... | Aber-banc | Anheddiad | SN3541 | Ceredigion | Open OS Open Name link |
| Aberbargod | Aberbargoed | Aberbargoed | Anheddiad | SO1500 | Caerffili | Open OS Open Name link |
| Aberbechan | ... | Aberbechan | Anheddiad | SO1393 | Powys | Open OS Open Name link |
| Aberbîg | ... | Aberbeeg | Anheddiad | SO2102 | Blaenau Gwent | Open OS Open Name link |
| Aberbowlan | ... | Aberbowlan | Anheddiad | SN6938 | Sir Gaerfyrddin | Open OS Open Name link |
| Aberbrân | ... | Aberbrân | Anheddiad | SN9829 | Powys | Open OS Open Name link |
| Abercannaid | ... | Abercannaid | Anheddiad | SO0503 | Merthyr Tudful | Open OS Open Name link |
| Aber-carn | ... | Aber-carn | Anheddiad | ST2194 | Caerffili | Open OS Open Name link |