Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
acá
←
Latin
eccum
(inherited)
←
Latin
hac
(mention)
←
Old Portuguese
aca
(inherited)
→
Spanish
acá
(cognate)