Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
asse
←
Proto-Celtic
*[[ad-]][[sādos|sādo-]]syos
(inherited)
→
Welsh
hawdd
(cognate)
→
Old Irish
anse
(affix)