Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
deigryn
←
Proto-Celtic
*dakrom
(inherited)
←
Proto-Indo-European
*dáḱru
(inherited)
←
Cornish
dager
(cognate)