Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
ni
←
Proto-Brythonic
*ni
(inherited)
←
Proto-Brythonic
*nei
(inherited)
←
Proto-Celtic
*snīs
(inherited)
←
Proto-Celtic
*neɸūss
(inherited)
←
English
we
(link)
←
Proto-Indo-European
*népōts
(inherited)