Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*dubrokū
→
Breton
dourgi
(inherited)
→
Welsh
dwrgi
(inherited)
→
Welsh
dyfrgi
(inherited)
→
Cornish
dowrgi
(inherited)
→
Old Irish
doburchú
(inherited)