Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
segur
←
Proto-Brythonic
*segʉr
(inherited)
←
Welsh
sicr
(doublet)
←
Latin
sēcūrus
(derived)
←
Middle Welsh
segur
(inherited)
→
Welsh
siwr
(doublet)
→
Welsh
sicr
(doublet)
→
Welsh
segurswydd
(link)