Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Breton
evañ
←
Proto-Celtic
*ɸibeti
(inherited)
←
Welsh
yfed
(cognate)
←
Proto-Indo-European
*peh₃-
(derived)
←
Cornish
eva
(cognate)
←
Old Breton
evaff
(inherited)
←
Old Irish
ibid
(cognate)