Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
tóin
←
Proto-Celtic
*tuknā
(inherited)
←
English
thigh
(cognate)
←
Scottish Gaelic
tòin
(cognate)
←
Proto-Indo-European
*tewk-
(derived)
←
Old Irish
tón
(inherited)
→
English
thigh
(cognate)
→
Irish
atóin
(prefix)
→
Sanskrit
तोक
(cognate)