Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
eachtrán
←
Irish
(suffix)
←
Irish
án
(suffix)
←
Old Irish
echtar
(derived)
→
Welsh
dieithr
(cognate)