Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
Pembroke
←
Proto-Brythonic
[[*penn|*Penn]]-[[*broɣ|broɣ]]
(derived)
←
Welsh
Penfro
(cognate)
→
English
Pembrokeshire
(affix)