Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
awdurdod
←
Proto-Brythonic
*audʉrdọd
(inherited)
←
Latin
auctōritās
(derived)
←
Middle Welsh
awdurdawt
(inherited)