Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*drukos
→
Breton
drouk
(inherited)
→
Welsh
drwg
(inherited)
→
Irish
droch-
(inherited)
→
Scottish Gaelic
droch
(inherited)
→
Cornish
drog
(inherited)
→
Old Irish
droch
(inherited)