Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
un
←
Latin
ūnus
(inherited)
←
Old Portuguese
un
(inherited)
←
Old Portuguese
ũu
(mention)
→
Galician
nun
(mention)
→
Galician
dun
(mention)
→
Galician
cun
(mention)