Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
Gwenhwyfar
←
Proto-Brythonic
*Gwɨnnohuɨβar
(derived)
←
Welsh
Gwenhwyfar
(mention)