Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
seichid
←
Proto-Celtic
*sekʷeti
(inherited)
←
Proto-Indo-European
*sekʷ-
(derived)
→
Scottish Gaelic
teagaisg
(affix)
→
Old Irish
aithesc
(affix)
→
Old Irish
dodíuschi
(affix)