Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
geot
←
Proto-Celtic
*gʷeltā
(inherited)
←
Welsh
gwellt
(cognate)
←
Cornish
gwels
(cognate)
←
Old Breton
guelt
(inherited)