Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
fégaid
←
Old Irish
do·éccai
(inherited)
←
Old Irish
con·fécha
(mention)
←
Old Irish
com·fechinn
(mention)
→
Irish
féach
(mention)
→
Irish
fiacháil
(derived)
→
Scottish Gaelic
feuch
(mention)