Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Sardinian
deghe
←
Proto-Indo-European
*déḱm̥
(derived)
←
Proto-Italic
*dekem
(inherited)
←
Latin
decem
(inherited)