Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
ceiliog
←
Proto-Brythonic
*kėljọg
(inherited)
←
Proto-Celtic
*kalyākos
(inherited)
←
Proto-Indo-European
*kleh₁-
(derived)
←
Middle Welsh
keilyawc
(inherited)
→
Welsh
ceiliogod
(affix)
→
Irish
coileach
(cognate)
→
Scottish Gaelic
coileach
(cognate)