aber

aberoedd (plural)
ebyr (plural)
aber (mutation mutation-radical)
haber (mutation prothesis-h)

From Proto-Brythonic *aber, from Proto-Celtic *adberos.


afon

afonydd (plural)
afon (mutation mutation-radical)
hafon (mutation prothesis-h)

From Middle Welsh afon, from Proto-Brythonic *aβon, from Proto-Celtic *abū, from Proto-Indo-European *h₂ep-h₃ōn-, from *h₂ep- (“body of water”).


Tawe

Tawe (mutation mutation-radical)
Dawe (mutation mutation-soft)
Nhawe (mutation mutation-nasal)
Thawe (mutation mutation-aspirate)


llyn

llynnoedd (plural)
llynnau (plural)
llyn (mutation mutation-radical)
lyn (mutation mutation-soft)

From Middle Welsh llynn, from Proto-Brythonic *llɨnn, from Proto-Celtic *lindos (“lake, liquid”).


Cadan

Cadan (mutation mutation-radical)
Gadan (mutation mutation-soft)
Nghadan (mutation mutation-nasal)
Chadan (mutation mutation-aspirate)


môr

moroedd (plural)
môr (mutation mutation-radical)
fôr (mutation mutation-soft)

From Proto-Brythonic *mor, from Proto-Celtic *mori, from Proto-Indo-European *móri.

(figuratively) plenty, abundance, copiousness


Môr Baltig

Baltic Sea (a sea in northern Europe), connected to the Atlantic.


Môr Iwerddon

Môr Iwerddon (mutation mutation-radical)
Fôr Iwerddon (mutation mutation-soft)


cefnfor

cefnforoedd (plural)
cefnfor (mutation mutation-radical)
gefnfor (mutation mutation-soft)
nghefnfor (mutation mutation-nasal)
chefnfor (mutation mutation-aspirate)


gweilgi

gweilgïoedd (plural)
gweilgi (mutation mutation-radical)
weilgi (mutation mutation-soft)
ngweilgi (mutation mutation-nasal)

From Proto-Celtic *wailos (“wolf, howler”) + ci (“dog”). Compare also Irish faolchú (“wolf”).


pwll

pyllau (plural)
pwll (mutation mutation-radical)
bwll (mutation mutation-soft)
mhwll (mutation mutation-nasal)
phwll (mutation mutation-aspirate)

From Middle Welsh pwll, from Proto-Brythonic *pull, from Old English pull, pyll (“tidal pool”) or Old Norse pollr (whence Icelandic pollur), from Proto-Germanic *pullaz (“pool”). Cognate with Breton poull and Cornish, Irish, and Scottish Gaelic poll.


Dyffryn y Brenhinoedd

Dyffryn y Brenhinoedd (mutation mutation-radical)
Ddyffryn y Brenhinoedd (mutation mutation-soft)
Nyffryn y Brenhinoedd (mutation mutation-nasal)

Valley of the Kings
Valley of the Kings#English

Valley of the Kings (Egyptian valley known for its tombs)


Mynwy

Mynwy (mutation mutation-radical)
Fynwy (mutation mutation-soft)


bae

baeau anabl


bae

bae (mutation mutation-radical)
fae (mutation mutation-soft)
mae (mutation mutation-nasal)

See the etymology of the corresponding lemma form.


llwch

llychau (plural)
llwch (mutation mutation-radical)
lwch (mutation mutation-soft)

Either borrowed from Goidelic or inherited from *lokku, a geminate form of Proto-Celtic *loku. Compare Irish loch, Scottish Gaelic loch.


Gwy

Gwy (mutation mutation-radical)
Wy (mutation mutation-soft)
Ngwy (mutation mutation-nasal)

Unknown; first attested as Old Welsh Guoy. The element -wy is found in other river names such as Monnow, Medway, and Conwy. A borrowing from a Pre-Celtic substrate language cannot be ruled out, as gwy does not match any obvious nouns in Welsh.


porth

From Proto-Brythonic *porθ, borrowed from Latin porta (“gate, passage”).


ffrwd

From Proto-Brythonic *frud, from Proto-Celtic *srutom, from Proto-Indo-European *srew- (“flow, stream”).


Nedd

English: Neath

Neath Port Talbot
Neath Port Talbot#English

Neath (a river in Neath Port Talbot county borough)


Teifi

Teifi (mutation mutation-radical)
Deifi (mutation mutation-soft)
Nheifi (mutation mutation-nasal)
Theifi (mutation mutation-aspirate)

Of Brythonic origin, probably from the same root as Tafwys and possibly also Thames. Also compare the names Tamar, Tavy, Towy, Teviot, Tweed, Taw, Tiverton.

A river that forms the boundary between Ceredigion and Carmarthenshire


Tafwys

Tafwys (mutation mutation-radical)
Dafwys (mutation mutation-soft)
Nhafwys (mutation mutation-nasal)
Thafwys (mutation mutation-aspirate)

From Proto-Brythonic *taβ̃uɨs, from Proto-Celtic *tamesās, probably ultimately of Celtic origin, but the exact root is unclear; see Thames.


Merswy

Merswy (mutation mutation-radical)
Ferswy (mutation mutation-soft)


Dyfi

Dyfi (mutation mutation-radical)
Ddyfi (mutation mutation-soft)
Nyfi (mutation mutation-nasal)


Dyfrdwy

Dyfrdwy (mutation mutation-radical)
Ddyfrdwy (mutation mutation-soft)
Nyfrdwy (mutation mutation-nasal)

Of Brythonic origin. Equivalent to dwfr (“water”) + dwyw (“god”).


Efyrnwy

Efyrnwy (mutation mutation-radical)
Hefyrnwy (mutation prothesis-h)

Vyrnwy (a river in Powys, Wales and Shropshire, England)


Ogwr

Ogwr (mutation mutation-radical)
Hogwr (mutation prothesis-h)

Ogmore (a river in Bridgend county borough)


Wysg

Wysg (mutation mutation-radical)
Hwysg (mutation prothesis-h)

From Middle Welsh Wÿsk, from Proto-Brythonic *Uɨsk, from Proto-Celtic *ɸeiskos (“fish”); cognate with Irish iasc (“fish”).


Llwchwr

→ English: Loughor, Llwchwr

Llwchwr (mutation mutation-radical)
Lwchwr (mutation mutation-soft)

Loughor (a river in Carmarthenshire, and the city and county of Swansea, southern Wales).


Taf

Taf (mutation mutation-radical)
Daf (mutation mutation-soft)
Nhaf (mutation mutation-nasal)
Thaf (mutation mutation-aspirate)

Likely from the same Celtic source of the rivers Tafwys, Teifi, Dyfi, Tawe, from a root meaning "dark" or "water." Also see Thames.


pwll nofio

pyllau nofio (plural)
pwll nofio (mutation mutation-radical)
bwll nofio (mutation mutation-soft)
mhwll nofio (mutation mutation-nasal)
phwll nofio (mutation mutation-aspirate)

/ˌpʊɬ ˈnɔvjɔ/

/ˌpʊɬ ˈnɔvjɔ/


camlas

cy-noun

camlas f (plural camlesi or camlasau or camlesydd)

camlesi (plural)
camlasau (plural)
camlesydd (plural)
camlas (mutation mutation-radical)
gamlas (mutation mutation-soft)
nghamlas (mutation mutation-nasal)
chamlas (mutation mutation-aspirate)

cam (“crooked; false”) + glas (“stream”)


Clydach

From a Proto-Celtic root meaning "flow strongly".

Clydach (a short river in Monmouthshire, which joins the River Usk).

Clydach (a river in Neath Port Talbot county borough, Wales, which joins the River Neath).


Môr y Canoldir

Mediterranean Sea
Mediterranean Sea#English

Mediterranean Sea (a sea between Europe and Africa)


Môr Du

Black Sea (a sea between Europe and Asia)


Môr Marw

the Dead Sea (a highly saline lake in Israel, Palestine and Jordan)


Llyn Tegid

Llyn Tegid (mutation mutation-radical)
Lyn Tegid (mutation mutation-soft)


Afon Merswy

Old English Mæres ēa (“boundary river”).


porthladd

cy-noun

porthladd m (plural porthladdoedd or porthladdau, diminutive porthleddyn)

porthladdoedd (plural)
porthladdau (plural)
porthleddyn (diminutive)
porthladd (mutation mutation-radical)
borthladd (mutation mutation-soft)
mhorthladd (mutation mutation-nasal)
phorthladd (mutation mutation-aspirate)

From earlier porthloedd, porthlodd, from porth (“porth”) + *lloedd (“quiet”).


Môr Coch

Calque of Latin Mare Rubrum, itself a calque of Ancient Greek Ἐρυθρᾱ̀ θάλασσα (Eruthrā̀ thálassa).

der

Ἐρυθρᾱ̀ θάλασσα

Red Sea (a sea in the Indian Ocean, between Arabia and Africa)


Culfor Dofr

Strait of Dover (a strait in the English Channel)


culfor

culforoedd (plural)
culfor (mutation mutation-radical)
gulfor (mutation mutation-soft)
nghulfor (mutation mutation-nasal)
chulfor (mutation mutation-aspirate)


afonig

afonigion (plural)
afonig (mutation mutation-radical)
hafonig (mutation prothesis-h)