Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
tellach
←
Proto-Indo-European
*tep-
(root)
←
Old Irish
tenlach
(inherited)
←
Old Irish
teine
(mention)
←
Old Irish
-lach
(mention)
→
Irish
teallach
(inherited)