Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Celtic
*swesūr
→
Welsh
chwaer
(inherited)
→
Irish
deirfiúr
(derived)
→
Irish
siúr
(inherited)
→
Scottish Gaelic
piuthar
(inherited)
→
Manx
shuyr
(inherited)
→
Old Irish
siur
(inherited)