Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Cornish
glaw
←
Breton
glav
(cognate)
←
Proto-Celtic
*glawā
(inherited)
←
Proto-Indo-Aryan
*ȷ́alám
(cognate)
←
Sanskrit
जल
(cognate)
→
Cornish
glawlen
(compound)