Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*lowatrom
→
Galician
Ludrio
(derived)
→
Galician
Ludro
(derived)
→
Latin
lavabrum
(cognate)