Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
feamainn
←
Proto-Brythonic
*Wïmmon
(cognate)
←
French
goémon
(cognate)
←
Proto-Indo-European
*weyp-
(derived)
←
Old Breton
goumon
(cognate)
←
Old Irish
[[femain]], [[femmain]]
(inherited)
→
French
goémon
(cognate)
→
Irish
feamnach
(affix)