Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
iontas
←
Proto-Celtic
*gnātos
(derived)
←
Irish
ionadh
(mention)
←
Proto-Indo-European
(derived)
←
Proto-Indo-European
*ǵneh₃-
(mention)
←
Old Irish
ingantus
(inherited)
←
Old Irish
ingnad
(mention)
←
Old Irish
in-
(mention)
←
Old Irish
gnáth
(mention)
→
Manx
yindys
(cognate)