Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*beru
→
English
Percival
(derived)
→
Gaulish
berula
(inherited)
→
Spanish
berro
(derived)
→
Old Irish
bir
(inherited)
→
Old Irish
bir
(inherited)