Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latin
Lemavi
←
Proto-Celtic
*lēmo-
(derived)
←
Proto-Celtic
(mention)
←
Proto-Indo-European
*h₁élem
(derived)
→
Galician
Lemos
(derived)