Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
gylfin
←
Proto-Brythonic
*gulbino-
(inherited)
←
Cornish
gelvin
(link)
→
Welsh
gylfinir
(compound)
→
Latin
gulbia
(cognate)