Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
English
Lostwithiel
←
Breton
lost
(mention)
←
Breton
gwez
(cognate)
←
Old Cornish
gwydhyel
(mention)