Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Fala
un-a
←
Proto-Indo-European
*óynos
(derived)
←
Latin
ūna
(inherited)
←
Old Portuguese
ũa
(inherited)