Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
killi
←
Breton
kelloù
(link)
←
Proto-Celtic
*kaldit-
(inherited)
←
Welsh
celli
(cognate)
←
English
grove
(link)
←
Old Irish
caill
(cognate)
→
Breton
killioù
(suffix)