Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Gaulish
Segomaros
←
Gaulish
*segos
(mention)
←
Gaulish
*māros
(mention)
←
Proto-Celtic
*segos
(derived)
←
Proto-Celtic
*māros
(derived)