Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
kousket
←
Proto-Celtic
*kuxsketi
(inherited)
←
Welsh
cysgu
(cognate)
←
Proto-Indo-European
*ḱewb-
(inherited)
←
Cornish
koska
(cognate)
←
Latin
cubō
(cognate)
→
Welsh
cysgu
(cognate)