Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
err
→
Irish
earr
(inherited)
→
Scottish Gaelic
eàrr
(inherited)
→
Ancient Greek
ὄρρος
(cognate)
→
Old Armenian
ոռ
(cognate)