Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Old Irish
íath
←
Proto-Celtic
*ɸētu
(inherited)
←
Proto-Indo-European
*peyH-
(root)
←
Proto-Indo-European
*peyH-
(derived)
→
English
Helvetii
(cognate)
→
Irish
iath
(inherited)
→
Scottish Gaelic
iadh
(cognate)
→
Latin
Helvetius
(cognate)