Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
tywyll
←
Proto-Brythonic
*tɨβ̃uɨl
(inherited)
←
Proto-Celtic
*temeslos
(inherited)
←
Proto-Indo-European
*temH-
(root)
←
Proto-Indo-European
*temH-
(derived)
←
Old Welsh
timuil
(inherited)