Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Latin
galleta
←
Gaulish
galla
(derived)
←
English
gallon
(link)
←
Proto-Indo-European
*kel-
(derived)
←
Latin
*galla
(mention)
→
Portuguese
galão
(mention)