Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Piedmontese
eut
←
French
huit
(cognate)
←
Italian
otto
(cognate)
←
Proto-Italic
*oktō
(inherited)
←
Latin
octō
(inherited)