Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
pok
←
Welsh
impog
(cognate)
←
Welsh
pocyn
(mention)
←
Welsh
pocan
(mention)
←
Latin
pax
(derived)
←
Old Irish
póc
(cognate)
←
Middle Breton
pocq
(inherited)