Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Welsh
chwaer
←
Breton
c'hoar
(cognate)
←
Proto-Brythonic
*hwehir
(inherited)
←
Proto-Celtic
*swesūr
(inherited)
←
Proto-Indo-European
*swésōr
(inherited)
←
Old Irish
siur
(cognate)
→
Persian
خواهر
(cognate)