Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
kant
←
Proto-Brythonic
*kant
(inherited)
←
Proto-Celtic
*kantom
(inherited)
←
Proto-Indo-European
*ḱm̥tóm
(inherited)
→
English
cant
(cognate)
→
Breton
hanter-kant
(compound)
→
Latin
canthus
(cognate)