Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*dusnos
→
English
dun
(derived)
→
Irish
donn
(inherited)
→
Scottish Gaelic
donn
(inherited)
→
Manx
dhone
(inherited)
→
Manx
doan
(inherited)
→
Old Irish
donn
(inherited)