Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
cyntedd
←
Proto-Celtic
*kintu-sed-
(inherited)
←
Proto-Celtic
*sed-
(mention)
←
Old Irish
cétad
(cognate)