Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*kagyom
→
English
quay
(derived)
→
Welsh
caen
(derived)
→
Welsh
cae
(inherited)
→
Faroese
kai
(derived)
→
Old French
cail
(mention)
→
Irish
cé
(derived)
→
Latin
caium
(derived)
→
Norwegian Bokmål
kai
(derived)
→
Dutch
kade
(derived)
→
Norwegian Nynorsk
kai
(derived)
→
Swedish
kaj
(derived)