Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
claf
←
Proto-Celtic
*klamos
(inherited)
→
Welsh
clefyd
(affix)
→
Old Irish
clam
(cognate)
→
Albanian
helm
(cognate)