Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Middle Irish
matad
←
Old Irish
madrad
(derived)
→
Irish
madadh
(inherited)
→
Scottish Gaelic
madadh
(inherited)
→
Manx
moddey
(inherited)