Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
uchaf
←
Proto-Brythonic
*ʉxaβ̃
(inherited)
←
Proto-Celtic
*ouxsamos
(inherited)
→
English
Tawe-Uchaf
(derived)
→
Welsh
acha
(compound)