Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
add-
←
Proto-Brythonic
*ad-
(inherited)
←
Proto-Celtic
*ad-
(inherited)
←
English
at
(cognate)
←
Proto-Indo-European
*h₂éd
(derived)
←
Latin
ad
(cognate)