Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Indo-Portuguese
su
←
Proto-Indo-European
*swoyos
(derived)
←
Old Latin
*sovos
(derived)
←
Latin
suus
(derived)
←
Old Portuguese
seu
(derived)