Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Occitan
aqueste
←
Latin
eccum
(inherited)
←
Latin
iste
(mention)
←
Old Occitan
aquest
(inherited)
→
Sardinian
custu
(cognate)