Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Irish
suigh
←
Proto-Celtic
*sedeti
(inherited)
←
Proto-Indo-European
*sed-
(root)
←
Proto-Indo-European
*sed-
(derived)
←
Middle Irish
suidid
(inherited)
←
Old Irish
saidid
(inherited)
→
English
sit
(cognate)
→
Old English
sittan
(cognate)
→
Irish
eachtarshuigh
(prefix)
→
Scottish Gaelic
suidh
(cognate)
→
Manx
soie
(cognate)