Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
tona
←
Proto-Celtic
*tonnā
(derived)
←
Proto-Celtic
*tondā
(mention)
←
Proto-Indo-European
*tend-
(derived)
←
Proto-Indo-European
*temh₂-
(mention)
←
Old Irish
tonn
(cognate)
→
Galician
estonar
(prefix)