Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
ceathrú
←
Irish
ceathair
(affix)
←
Irish
-ú
(affix)
←
Old Irish
cethramad
(inherited)
←
Old Irish
cethair
(mention)
→
Irish
leis
(link)
→
Irish
ceanncheathrú
(affix)
→
Manx
kerroo
(cognate)