Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Piedmontese
des
←
French
dix
(cognate)
←
Italian
diece
(cognate)
←
Proto-Italic
*dekem
(inherited)
←
Latin
decem
(inherited)