Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
murúch
←
Proto-Celtic
*dawnā
(inherited)
←
Old Irish
murdúchann
(inherited)
←
Old Irish
murdúchu
(mention)
←
Old Irish
muir
(mention)
←
Old Irish
dúchann
(mention)
→
English
merrow
(derived)