Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
cummey
←
Middle Irish
cummad
(inherited)
←
Middle Irish
cummaid
(mention)
→
Manx
so-chummeydagh
(affix)
→
Manx
yl-chummey
(prefix)
→
Manx
neuchummeydagh
(affix)
→
Manx
neuchummeydys
(affix)