Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
gouloù
←
Proto-Brythonic
*gwoluɣʉ
(inherited)
←
Welsh
golau
(cognate)
←
Proto-Indo-European
*lewk-
(inherited)
←
Cornish
golow
(cognate)
←
Old Breton
guolou
(inherited)
→
Welsh
golau
(cognate)