Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
cù
←
Proto-Celtic
*kū
(inherited)
←
Proto-Indo-European
*ḱwṓ
(inherited)
←
Primitive Irish
ᚉᚒᚅᚐ
(inherited)
←
Old Irish
cú
(inherited)