Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
sal
←
Proto-Celtic
*salā
(inherited)
→
Irish
sail
(inherited)
→
Old Irish
salach
(affix)
→
Old Armenian
աղտ
(cognate)