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