Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
porffor
←
Irish
corcra
(mention)
←
Latin
purpura
(borrowed)
←
Old Irish
corcur
(cognate)
→
Faroese
korki
(cognate)
→
Irish
corcra
(cognate)
→
Irish
corcair
(cognate)