Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
affwys
→
Welsh
affwysol
(affix)
→
Welsh
affwysedd
(affix)
→
Welsh
affwysau
(affix)
→
Irish
aibhéis
(cognate)