Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
gwain
←
Breton
gouin
(cognate)
←
Proto-Brythonic
*gwėɣin
(inherited)
←
Cornish
gweyn
(cognate)
←
Latin
vāgīna
(derived)