Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
cerco
←
Spanish
cerco
(cognate)
←
Latin
circus
(inherited)
←
Portuguese
cerco
(cognate)
←
Old Portuguese
cerco
(inherited)
→
Galician
cerca
(link)