Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
corcair
←
Welsh
porffor
(cognate)
←
Ancient Greek
πορφύρα
(derived)
←
Latin
purpura
(derived)
←
Middle Irish
corcair
(inherited)
←
Old Irish
corcur
(inherited)