Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
eleni
←
Proto-Celtic
*so
(derived)
←
Proto-Celtic
*blēdanī
(mention)
←
Proto-Celtic
*so
(mention)
←
Proto-Celtic
*dīyos
(mention)
←
Welsh
heddiw
(mention)
←
Cornish
hevleni
(cognate)