Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
fíadach
←
Old Irish
fíad
(suffix)
←
Old Irish
ach
(suffix)
→
Irish
fiach
(inherited)
→
Scottish Gaelic
fiadhach
(inherited)
→
Manx
feeaihagh
(inherited)
→
Manx
feeaihaght
(inherited)