Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
moidynys
←
Manx
moidyn
(affix)
←
Manx
-ys
(affix)
←
Middle Irish
*maigdenas
(inherited)
→
Irish
maighdeanas
(cognate)