Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
dual
←
Proto-Celtic
*doklos
(inherited)
←
Proto-Indo-European
*dʰewgʰ-
(derived)
←
Proto-Indo-European
*doḱlos
(inherited)
←
Old Irish
dúal
(inherited)
←
Old Irish
dúal
(inherited)
→
Scottish Gaelic
dùth
(mention)