Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
tiomnacht
←
Irish
tiomna
(affix)
←
Irish
-acht
(affix)
→
Irish
díthiomnacht
(prefix)
→
Manx
çhymnaght
(cognate)