Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
guilley
←
Middle Irish
gilla
(inherited)
→
Manx
Guillaspick
(compound)
→
Manx
Gilchreest
(compound)