Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Scottish Gaelic
taois
←
Proto-Celtic
*taistos
(inherited)
←
Middle Irish
táes
(inherited)
←
Old Irish
taís
(inherited)
→
Manx
teayst
(cognate)