Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
tadall
←
Proto-Indo-European
*pelh₂-
(root)
←
Old Irish
tadall
(inherited)
→
Scottish Gaelic
tadhal
(inherited)
→
Middle Irish
céttadall
(affix)