Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*mlastos
→
Irish
blas
(inherited)
→
Irish
blas
(inherited(ga/cy))
→
Scottish Gaelic
blas
(derived)
→
Cornish
blas
(derived)
→
Middle Irish
blas
(inherited)
→
Old Irish
mlas
(inherited)