Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
gant
←
Proto-Celtic
*kanta
(inherited)
←
Welsh
gan
(cognate)
←
English
with
(link)
←
Old Breton
cant
(inherited)
→
Welsh
gan
(cognate)