Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
seilbh
←
Proto-Celtic
*selwā
(inherited)
←
Manx
shelloo
(cognate)
←
Old Irish
selb
(inherited)