Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*knāmis
→
Irish
cnámh
(inherited)
→
Scottish Gaelic
cnàimh
(inherited)
→
Manx
craue
(derived)
→
Old Irish
cnáim
(inherited)
→
Middle Welsh
knaw
(derived)