Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
derbráthair
←
Old Irish
derb
(prefix)
←
Old Irish
bráthair
(prefix)
→
Welsh
cefnder
(cognate)
→
Irish
deartháir
(inherited)
→
Manx
jarroo-vraar
(inherited)