Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
Mawrth
←
Breton
Meurzh
(cognate)
←
Cornish
Merth
(cognate)
←
Latin
mārtius
(borrowed)
→
Welsh
dydd Mawrth
(affix)
→
Welsh
nos Fawrth
(compound)