Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
tud
←
Proto-Brythonic
*tʉd
(inherited)
←
Proto-Celtic
*toutā
(inherited)
←
Proto-Indo-European
*tewtéh₂
(inherited)
→
Gaulish
touta
(cognate)
→
Welsh
alltud
(affix)
→
Persian
توده
(cognate)