Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
mercar
←
Latin
mercārī
(inherited)
←
Latin
mercor
(mention)
←
Old Portuguese
mercar
(inherited)
→
Galician
mercado
(link)