Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Indo-European
*tn̥néh₂
→
Welsh
tan
(inherited)
→
Welsh
dan
(inherited)
→
Middle Irish
tan
(inherited)
→
Old Irish
tan
(inherited)