Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
gorm
←
Proto-Brythonic
*gurm
(inherited)
←
Proto-Celtic
*gurmos
(inherited)
←
Welsh
gwrm
(cognate)
→
Welsh
gwrm
(cognate)