Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
bych
←
Proto-Brythonic
*bɨx
(inherited)
←
Proto-Celtic
*bikkos
(inherited)
←
Welsh
bach
(doublet)
←
Welsh
bychan
(link)
←
Welsh
Dinbych
(link)
←
Welsh
byddech
(link)
←
Welsh
byddych
(link)
→
English
Denbigh
(compound)
→
Welsh
bychod
(suffix)