Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
feasta
←
Middle Irish
festa
(inherited)
←
Old Irish
fecht-sa
(derived)
→
Scottish Gaelic
fhathast
(cognate)
→
Old Irish
festa
(link)