Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
amar
←
Proto-Celtic
*amarom
(inherited)
←
Welsh
afar
(cognate)
→
Irish
amhrán
(derived)
→
Scottish Gaelic
or
(inherited)
→
Scottish Gaelic
òran
(derived)