Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Manx
pian
←
Ancient Greek
ποινή
(derived)
←
Latin
poena
(derived)
←
Middle Irish
pían
(inherited)
←
Old Irish
pén
(inherited)
→
Manx
ard-phian
(affix)
→
Manx
neuphiandagh
(affix)
→
Manx
piandagh
(affix)