Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cynnig
←
Breton
kinnig
(cognate)
←
Cornish
kynnik
(cognate)
←
Latin
condīcō
(borrowed)
→
Breton
kinnig
(cognate)
→
Welsh
-o
(mention)