Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
dec'h
←
Proto-Celtic
*desi
(inherited(cy/br))
←
Proto-Indo-European
*dʰǵʰyes-
(inherited(cy/br))