Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
Áedacán
←
Old Irish
Áed
(suffix)
←
Old Irish
acán
(suffix)
←
Old Irish
áed
(mention)
→
English
Egan
(derived)