| Element | Meaning | Examples |
| g- | A word starting g may be a mutated form of a word starting c | |
| gafl nf geifl pl | fork | Bwlch yr Eifl SH3645 Yr Eifl SH3644 |
| gafr nf geifr pl | goat | Corngafr SN2722 Cae'r-geifr SH1628 |
| gallt (see allt ) | ||
| gardd nf gerddi, garddau pl | garden; enclosure | Yr Ardd-lîn SJ2615 Ardderfin SN3215 |
| garth nm | promontory, hill, enclosure | Llanfihangel-ar-arth SN4539 Penarth ST1871 |
| garw adj | coarse, rough | Blaengarw SS9092 Bryn Garw SN8077 |
| gast nf | bitch | Cefngast SN9147 Cwm Gast SH8509 |
| gefail, efail nf | smithy | Cefn-y-gefail SN7838 Efail-newydd SH3535 |
| geirw np | rush of waters, waterfall | Pont Aber-Geirw SH7629 Geirw SN7727 |
| genau nm | pass, opening of a valley | Llanfihangel Genau'r-glyn SN6286 Coedgenau SN9933 |
| glais, nm/f | brook | Y Glais SN7000 Dulais SS6190 |
| glan nf | river-bank, hillock | Glan-Clwyd SJ0573 Glan Adda SH5770 |
| glas adj gleision pl | green, when referring to grass, pasture or leaves; or blue, when relating to the sea or air | Glasallt-fawr SN7330 Bryn Glas SJ0877 |
| glo nm | charcoal, coal | Nant-y-glo SO1910 Cwm-y-glo SH5562 |
| glyn nm | deep valley, glen | Glyn-hir SN6415 Llanfihangel Glyn Myfyr SH9949 |
| godre nm | edge or foot of hill | Godre'r-graig SN7507 Godreaman SO0100 |
| gof nm | smith | Rhyd-y-gof-isaf SN5552 Bron-y-gof SJ0856 |
| gofer nm | rill, overflow of a well | Gofer SH8472 Blaengofer SN3425 |
| gogof (see ogof ) | ||
| golau adj | light, bright | Alltgolau SN5125 Wernolau SN3617 |
| gorffwysfa nf | resting place | Pengorffwysfa SH4692 Gorffwysfa SH2131 |
| goror nm/f gororau, gororion pl | boundary | Gororion SN8773 Oror SJ0847 |
| gorsedd nf | tumulus, barrow, hillock | Gorsedd SJ1576 Yr Orsedd SJ3657 |
| graean nm | gravel | Graeanryd SJ2156 Bwlch y Graean SN3049 |
| gris nm grisiau pl | step | Tanygrisiau SH6845 Esgair Gris SN8868 |
| gro nm/f | gravel; gravel hill | Gronant SJ0983 Ro-wen SH7571 |
| grofft nf grofftau pl | croft | Grofft SH8104 Cefn Rofft SJ0049 |
| grug nm | heath, heather | Cefn-y-grug SO1664 Grugfryn SH8273 |
| grwn nm | ridge between two furrows, ridge in a field | Grwnamlwg SJ1515 Grwn-oer SJ0218 |
| gwaelod nm | foot of hill, bottom | Gwaelod-y-garth ST1183 Gwaelod SJ1416 |
| gwair nm | hay | Llwyngwair SN0739 Pant-y-gwair SN6067 |
| gwal nf gwaliau pl | wall | Rhos-y-gwaliau SH9434 Bryn-y-gwalia SJ1924 |
| gwâl nf | lair | Gwal y Filiast SN1725 Gwal-yr-hwch SN5807 |
| gwar nf | ridge (nape of neck) | Gwar-y-felin SN9335 Gwarallt SN5458 |
| gwartheg np | cows, cattle | Cors y Gwartheg-llwydion SH8032 Dolgwartheg SN4661 |
| gwas nm | youth, servant | Bryn-gwas SS5493 Ynysygwas SS7891 |
| gwastad nm | plain | Gwastadannas SH6553 Gwastad-mawr ST2989 |
| gwastad adj | flat | Gwastad SO2305 Gwastadfryn SH6709 |
| gwaun nf gweunydd pl | moor, mountain meadow, moor-land field, moor-land field | Waunarlwydd SS6095 Abergwaun SM9537 |
| gwden nf | willow-tree, reeds | Glangwden SN9688 Dolgwden SN9589 |
| gweirglodd nf | hay-field, meadow | Gweirglodd-gilfach SH8926 Nantyweirglodd SN2332 |
| gwely nm | bed, resting-place, family land | Gwely'r Misgl SS7880 Pen y Gwely SJ2133 |
| gwen (see gwyn) | ||
| gwenith nm | wheat | Bryngwenith SS9682 Dolgwenith SN9887 |
| gwerdd (see gwyrdd) | ||
| gwerfa nf | cool spot on mountain side where cattle or sheep seek shade | Werfa SS9194 Bwlch y Werfa SS9283 |
| gwern, gwernog nf | place where alders grow, swamp | Cilgwern SO2414 Pengwern SJ0176 |
| gwernen nf gwern pl | alder tree | Gwernaffield SJ2064 Gwernymynydd SJ2162 |
| gwiber nf | viper | Carregwiber SO0859 Allt y wiber SN4628 |
| gwig nf gwigau pl | grove, wood | Melin-y-wig SJ0348 Cefn-wig SN4761 |
| gwinllan nf | grove (vineyard) | Marianywinllan SH6270 Winllan SJ2121 |
| gwlad nf | region | Coed-y-wlad SJ2209 Cors-y-wlad SH4447 |
| gwlyb adj gwleb f | wet | Gwlybycoed SH4689 Gelli-wlyb SN8824 |
| gwndwn (see gwyndwn ) | ||
| gwrach nf | hag, witch | Rhyd-y-wrach SN1619 Blaen-gwrach SN8605 |
| gwreiddyn, gwraidd nm gwreiddiau pl | root | Gwreiddyn SH9474 Gwreiddiau SJ0419 |
| gwrych nm | (quickset) hedge | Gwrych Bedw SJ1048 Hen Wrych SH9278 |
| gwryd nm | fathom | Llangwryd-isaf SJ2337 Nantygwryd SH6856 |
| gwter (see cwter ) | ||
| Gwyddel nm Gwyddyl, Gwyddelod pl | Irishman | Gwyddel SH1425 Gwyddelwern SJ0746 |
| gwydden, gwŷdd nf pl | tree | Llyn y Grinwydden SJ0206 Glanwydden SH8180 |
| gwyddfa nf | mound, tumulus | Yr Wyddfa SH6054 Graig Trewyddfa SS6697 |
| gwylfa nf | look-out point | Gwylfa Hiraethog SH9459 Foel Wylfa SJ1933 |
| gwyn adj gwen f gwynion pl | white | Gaerwen SH4871 Bron-gwyn SN2843 |
| gwyndwn, gwndwn nm | grassland, lea | Gwndwn SN4737 Gwndwngwyn SM9027 |
| gwynt nm | wind | Tre-gwynt SJ0306 Moel y Gwynt SS8598 |
| gwyrdd adj gwerdd f gwyrddion pl | green | Dolaugwyrddon SN5546 Dolwerdd SN4924 |
| gyrfa nf | racecourse | Llannerch-yrfa SN8355 Pant-yr-yrfa ST2593 |
| hafn nf | gorge, ravine | Maeshafn SJ2060 Yr Hafnau SH9738 |
| hafod nf | summer dwelling | Nant-yr-hafod SN8791 Hafod-dywyll SH6815 |
| hafoty nm | summer dwelling | Hafoty SH8365 Hafoty'r Bwlch |
| haidd nm | barley | Maes-yr-haidd SN5630 Nant-yr-haidd SN9366 |
| halog adj | dirty, muddy | Rhydhalog ST0279 Pwllhalog SJ0877 |
| hardd adj | fine, fair | Pentre-hardd SN5907 Harlech SH5831 |
| haul nm | sun | Bolahaul SN4218 Bron Haul SH9669 |
| hebog nm/f | hawk | Moel Hebog SH5646 Mynydd Pwllyrhebog SS9691 |
| helfa nf | hunting-ground | Dolhelfa SN9273 Helfa SH5857 |
| heli nm | brine | Y Felinheli SH5267 Pwllheli SH3735 |
| helygen nf helyg pl | willow | Llanfihangel Helygen SO0464 Brynhelygen ST0578 |
| hen adj | old | Brynhenllan SN0039 Hendy-gwyn ar daf SN2016 |
| hendre(f) nf | winter dwelling, old home, permanent abode | Capel Hendre SN5911 Hendre SJ1967 |
| heol, hewl nf | street, road | Heol-las SS6998 Heol-y-cyw SS9484 |
| hesgen nf hesg pl | rush | Cwm-hesgen SH7829 Nant Hesgog SN9168 |
| hesgyn nm | bog | Penhesgyn SH5374 Ffridd Cwmhesgyn SH8742 |
| hir adj | long | Ynys-hir ST0292 Pont-hir ST3292 |
| hwch nf | sow, swine | Stryt-yr-hwch SJ3346 Gorsyrhwch SN6633 |
| hwnt adj | yonder | Pentrehwnt SS9275 Tu-hwnt-i'r-afon SH8167 |
| hwrdd nm hyrddod pl | ram | Cornhwrdd SN5402 Llwyn-yr-hwrdd SN2232 |
| hydd nm hyddod pl | stag | Moel-yr-hydd SH6745 Penhydd Fawr SS8093 |
| iet nf | gate | Iet-y-bwlch SN1628 Bwlch-yr-iet SN3021 |
| is pr | below, lower | Bangor Is-coed SJ3945 Is-afon SH9131 |
| isa(f) adj | lowest | Penisa'r-waun SH5563 Llangwryd-isaf SJ2337 |
| isel adj | low | Nant Ffriddisel SJ1241 Ffynnon Isel SJ0421 |
| iwrch nm iyrchod pl | roebuck | Nantiwrch SN7039 Pwlliwrch SH8301 |
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