| Word element | Meaning | Example of use (sound file links underlined) |
|---|---|---|
| gadair | see cadair | |
| Gadfan | see Cadfan | |
| gaer | see caer | Gelligaer |
| galed | see caled | |
| gallt | hill; slope, wood | |
| gam | see cam | |
| ganol | see canol | |
| Garmon | saint's name | Ffynnon Garmon |
| garn | see carn | Garngoch |
| garnedd | see carnedd | Garnedd-wen |
| garreg | see carreg | Garreg-goch |
| garrog | see carrog | |
| garth | hill, height; enclosure | Gwaelod-y-garth |
| gartre | see cartre | |
| gartref | see cartref | |
| garw | rough, coarse | Nantgarw |
| gawres | see cawres | |
| gefail | smithy | |
| gefn | see cefn | |
| gegin | see cegin | |
| geiliog | see ceiliog | |
| Gelert | see Celert | |
| gelli | see celli | Gelligaer |
| gelynen, gelyn | see celynen, celyn | |
| gilfach | see cilfach | Gilfach-goch |
| glan | river-bank, bank, hillock | Glanrhyd |
| glas | green, blue | Bryn-glas |
| glas, glais | (as in Dulas, Dulais) brook, stream | Glais |
| glo | coal | Nantyglo |
| gloddfa | quarry | |
| glyd | see clyd | |
| glyn | deep valley, glen | Glynebwy (Ebbw Vale) |
| goch | see coch | Gilfach-goch |
| goed | see coed | |
| goetre | woodland dwelling or farm | Goetre Fawr |
| gof | smith | |
| gog | see cog | |
| gogledd | north | |
| gollen | see collen | Llangollen |
| gors | see cors | Cwm-gors |
| graig | see craig | Graig Goch |
| grib | see crib | |
| gribin | see cribin | |
| grisiau | steps | Tan-y-grisiau |
| groes | see croes | Groes-wen |
| grug (adj. grugog) | heather, heathery (but see also crug) | Allt-y-grug; Rhosllannerchrugog |
| Gurig | see Curig | Llangurig |
| gwalch | hawk | Gwalchmai |
| gwaun | moor, mountain pasture | Gwaun-cae-gurwen |
| gwen | white, fair | Gwenddwr |
| gwern | place where alders grow, swamp | Gwernymynydd |
| gwig | wood | |
| gwm | see cwm | |
| gwrt | see cwrt | |
| Gwy | Wye (river) | |
| Gwyddel | Irishman | Gwyddelwern |
| gwyn, (feminine gwen) | white | Gwynfynydd |
| gwynt | wind | |
| gwyrdd | green | |
| Gybi | see Cybi | |
| gyll | see cyll | |
| Gynolwyn | river in Merionethshire | Abergynolwyn |
| Gynon | see Cynon | |
| gyrn | see cyrn |
W - (often a contraction of Gw..; e.g. "Gwaun" becomes "Waun" in "Waunfawr")
| Word element | Meaning | Example of use (sound file links underlined) |
|---|---|---|
| waun | see gwaun | Waunarlwydd |
| wen | see gwyn/gwen | Afon-wen |
| wern | see gwern | Wernfawr |