Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
carpat
←
Proto-Celtic
*karbantos
(inherited)
→
Welsh
cerbyd
(borrowed)
→
Irish
carbad
(derived)
→
Scottish Gaelic
carbad
(derived)