Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
garr
←
Gaulish
*garra
(cognate)
←
Proto-Celtic
*garrā
(inherited)
←
Ancient Greek
ἄκαρα
(cognate)
→
Spanish
garra
(cognate)
→
Cornish
diwar
(prefix)
→
Portuguese
garra
(cognate)