Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
sych
←
Proto-Brythonic
*sɨx
(inherited)
←
Latin
siccus
(derived)
←
Old Welsh
sich
(inherited)
←
Middle Welsh
sych
(inherited)
→
Welsh
sychu
(suffix)
→
Welsh
sychin
(compound)
→
Welsh
sychnant
(compound)
→
Esperanto
seka
(mention)