Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
tad
←
Proto-Brythonic
*tad
(inherited)
←
Proto-Celtic
*tatos
(inherited)
→
Welsh
tadau
(affix)
→
Welsh
hendad
(compound)
→
Welsh
llystad
(prefix)
→
Latvian
tētis
(cognate)