Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
macoil
←
Manx
mac
(affix)
←
Manx
-oil
(affix)
→
Scottish Gaelic
macail
(cognate)