Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
elw
←
Proto-Celtic
*selwā
(inherited)
←
Welsh
helw
(mention)
←
Irish
seilbh
(cognate)
←
Proto-Indo-European
*selh₁-
(derived)
→
Welsh
elwa
(affix)