Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
grua
←
Proto-Celtic
*groudos-
(derived)
←
Welsh
grudd
(cognate)
←
Scottish Gaelic
gruaidh
(cognate)
←
Old Irish
gruad
(inherited)
→
Welsh
grudd
(cognate)
→
Scottish Gaelic
gruaidh
(mention)