Tögɨduβn

British Latin: Togidubnus, Cogidubnus

From *tögɨ-, from Proto-Celtic *togi- (“oath”) + *duβn (“deep”), from Proto-Celtic *duβnos (“world”).


Broxoβ̃aɣl

Old Breton: Brocmail

Old Welsh: Brocmail

Middle Welsh: Brochvael

Welsh: Brochfael

→ Latin: Brochmael [825-850 CE]

→ Latin: Brohomagli (gen.sg.) [500-549 CE]

From *brox (“badger”) + *maɣl, from Proto-Celtic *maglos (“a noble, chief”).


Tɨɣernoβ̃aɣl

Old Breton: Tiernmael

→ Brytho-Latin: Tegernomali


Kaduwallọn

Old Breton: Kaduuallon, Catuuallon

Breton: Kadwallawn

Cornish: Kaswallawn

Old Welsh: Cadwallawn

desc

Middle Welsh: Catgollaun, Catguallaun, Katwallaun

Welsh: Cadwallon

→ Old English: Cædwalla

→ Latin: Caedualla

a male given name, equivalent to English Cadwallon


Gworθɨɣern

Old Breton: Guorthigern

Breton: Gourziern

Old Welsh: Guorthigirn

Middle Welsh: Gwrtheyrn

Welsh: Gwrtheyrn

→ Old English: Wyrtġeorn [9th c. CE]

→ Latin: Vortigernus, Gurthigernus [5th–6th c. CE?], Vertigernus [725 CE], Uvertigernus [9th c. CE], Vurtigernus

→ English: Vortigern

From Proto-Celtic *Uɸortigernos. Equivalent to *gwo- (“sub-, under”) + *tɨɣern (“lord”).


Urboɣen

Old Breton: Urien

Cornish: Uren (likely reborrowing)

Old Welsh: Urbagen, Urbgen [828 CE], Urgen

Middle Welsh: Urbien, Urien, Yrien

Welsh: Uren

→ English: Orian

From *urb, from Proto-Celtic *orbos (“heir”) + *gen, from Proto-Celtic *genos (“family; birth”).


Llowβ̃arx

Old Cornish: Loumarch

Old Welsh: Loumarch, Leumarch

Middle Welsh: Llywarch

Welsh: Llywarch

>? Old Welsh: Luguach [955 CE]


Artognou

Late Brythonic: *Arθgnọw

Old Breton: Artgnou [882 CE]

From *arθ (“bear”), from Proto-Celtic *artos + *gnọw (“knowledge”), from Proto-Celtic *gnāwos.


Tankoriɣ

→ Brytho-Latin: Tancorix [400-599 CE]


Tʉdür

Old Welsh: Tutir (from the nominative), Tutri (from the accusative)

Welsh: Tudur

English: Tudor


Kadüdɨɣern

Old Welsh: Categern, Catigern

Middle Welsh: Cattegirn

Welsh: Cadeyrn

From Proto-Celtic *Katutigernos. Equivalent to *kad (“battle”) + *tɨɣern (“lord”).


Awɨɣėn

Old Breton: Even, Ewen

Middle Breton: Ivan

Breton: Yven, Ivin

→ French: Ivain

Old Welsh: Ougein, Eugein

Middle Welsh: Owein, Ewein, Ywein

Welsh: Owain

→ Middle English: Owain, Owayne, Ywain

English: Owen

→ Medieval Latin: Eugenius


Gwɨroɣal

Old Breton: Uuruual, Uurgual

Middle Breton: Gurgual

Old Welsh: Guruol, Guorguol, Gurguol

Middle Welsh: Gurgal


Gwɨroɣnọw

→ Brytho-Latin: Uirognous


Duβnoɣen

Welsh: Dyfnien

→ Brytho-Latin: Dumnogeni


Gwɨroɣust

Old Welsh: Gurgust, Gorust

Welsh: Gwrwst


Tʉdowal

Old Welsh: Tutagual, Tudwal, Tutwal, Tudgual

Welsh: Tudwal

From Proto-Celtic *Toutowalos. Equivalent to *tʉd (“people”) + *gwal (“prince, chief”).


Kunowal

Old Breton: Conuual

Old Welsh: Congual, Cingual

Middle Welsh: Cynwal, Gynwal

Welsh: Cynwal

→ Latin: Cunovalī (gen.) [533-566 CE]


Duβnowal

Breton: (possibly) Dunvel

Old Welsh: Dumnagual [10th c. AD]

desc

Middle Welsh: Dyuynwal, Dyvynwal, Dyfynwal

Welsh: Dyfnwal


Karadọg

Breton: Karadeg

Middle Welsh: Caratawc

Welsh: Caradog

→ Latin: Caratacus, Caractacus

→ Old English: Cerdic


Uindiorix

From Proto-Celtic *windos (“white”) + *rīxs (“king”).


Bodoɣnọw

Old Breton:

Breton: Budnou

→ Latin: Budnouenus [850-999 CE]

→ Latin: Bodognous (gen.) [500-600 CE]

From *bodw, from Proto-Celtic *bodwos (“crow; battle”) + *gnọw (“knowledge”), from Proto-Celtic *gnāwos.


Briɣoβ̃aɣlos

Late Brythonic: *Brioβ̃aɨl

Old Welsh: Briamail [950-999 CE]

Middle Welsh: Briauail

→ British Latin: Brigomaglos [450-499 CE]

From *briɣ, from Proto-Celtic *brīgos, *brīgā (“might, power”) + *maɣl, from Proto-Celtic *maglos (“chief, noble”).


Blėðɨjʉð

Old Cornish: Bleidiud

Middle Welsh: Bleydiud, Bleiddut

Welsh: Bleiddudd

From *blėð (“wolf”) + *jʉð (“lord”), from Proto-Celtic *yowdos (“judge”).


Ėljʉð

Old Cornish: Iliud

Middle Welsh: Eliud

Welsh: Eiludd

From *ėl (“second, other; all”) + *jʉð (“lord”), from Proto-Celtic *yowdos (“judge”).


Jʉðonerθ

Old Cornish: Iudnerth

Middle Welsh: Iudnerth

Welsh: Idnerth

From *jʉð (“lord”) + *nerθ (“strength, force”).


Grifujʉð

Old Cornish: Grifiud

Cornish: Grifyuth, Griffuth

Old Welsh: Gripiud, Grippiud, Griphiud

Middle Welsh: Gripiud

desctree

Welsh: Gruffudd
→ English: Griffith, Griffin, Griffiths

→ Latin: Griffinus

English: Griffin

Possibly Latin grȳphus (“griffin”) + *jʉð (“lord”).


Maɨlgun

Old Welsh: Mailgun

Middle Welsh: Maelgwn

Welsh: Maelgwn

→ Late Latin: Maglocunus

→ English: Maglocune


Gwɨnnohuɨβar

Breton: Gwenivar

Middle Cornish: Gwynnever [ca. 1500]

Cornish: Jennifer, Gweniver

→ English: Jennifer

Old Welsh: *Guinhuifar (< *Gwɨnnohuɨβ̃ar?)

Middle Welsh: Gwenhwyfar

Welsh: Gwenhwyfar

→ Medieval Latin: Guennuvar [ca. 1130], Guanhuuara [ca. 1136], Guennuuar [ca. 1150], Wennevereia [ca. 1220]

Old French: Genievre

Middle French: Genievre

French: Guenièvre

→ Middle English: Guinevere

English: Guinevere

→ Galician: Xenebra

→ Italian: Ginevra

→ Portuguese: Genebra

→ Spanish: Ginebra

Unknown; possibly from *gwɨnn (“white”) + *huɨβar, from Proto-Celtic *seibaris (“spirit, demon”). Perhaps cognate with Old Irish Finnabair.


Bʉðig

Breton: Budic

Welsh: Buddug


Gwurkʉβ̃

Old Breton: Gurcum

Middle Breton: Gourcunff, Gourcuff

Breton: Gourkuñv

Middle Welsh: Gurku

Welsh: Gurcu

From *gwur (“man, husband”) + *kʉβ̃ (“dear, nice”), from Proto-Celtic *koimos.


Ἀργεντοκόξος

From Proto-Celtic *argantom (“silver”) + *koxsā (“leg”); corresponding to late *arɣant + *koɨs. Cited in a Koine Greek text by Dio Chrysostom.


Kʉstentin

Old Breton: Custentin

Breton: Kustentin

Old Cornish: Custentin

Old Welsh: Custenhin, Custennhin

desc

Middle Welsh: Custenin, Custennin, Custenhin

Welsh: Cystennin

Borrowed from Vulgar Latin Cōstantīnus, from Latin Cōnstantīnus.

a male given name from Latin, equivalent to English Constantine


Kunoβ̃ọr

⇒? Breton: Tregonveur, Plougonveur

Old Welsh: Conmor (early)

Middle Welsh: Kynvawr, Kynwawr

Welsh: Cynfawr (historical)

→ Latin: Conomorus, Cunomorus, Quonomorius

→ English: Conomor

→ French: Conomor

From *kun- (“dog”, oblique stem) + *mọr (“great”), literally “big dog”.