Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
gwddf
←
Breton
gouzoug
(cognate)
←
Breton
goûg
(mention)
←
Welsh
gwddwg
(mention)
←
Welsh
gyddfau
(mention)
←
Old Breton
guodoc
(cognate)
←
Old Irish
fodb
(cognate)
←
Middle Welsh
-
(cognate)
←
Middle Welsh
gedueu
(mention)
←
Middle Welsh
wðwc
(mention)
←
Middle Welsh
wddf
(mention)
←
Middle Welsh
wddw
(mention)
←
Middle Breton
gouzouc
(cognate)
→
Welsh
gwddw
(link)
→
Welsh
gwddwg
(link)