Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Sardinian
otanta
←
Proto-Indo-European
*oktōḱomt
(inherited)
←
Proto-Indo-European
*oḱto(w)-dḱomt
(mention)
←
Latin
octāgintā
(inherited)
←
Latin
octōgintā
(mention)