Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
áu
←
Proto-Celtic
*ausos
(inherited)
←
Proto-Indo-European
*h₂ṓws
(inherited)
→
English
ear
(cognate)
→
Ancient Greek
οὖς
(cognate)
→
Middle Irish
ó
(inherited)