Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Portuguese
si
←
Proto-Indo-European
*so
(inherited)
←
Latin
sīc
(inherited)
→
Portuguese
si
(inherited)
→
Portuguese
sim
(inherited)