Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Proto-Indo-European
*Hyeh₂ǵ-yu-
→
Spanish
ayuno
(derived)
→
Galician
xaxún
(derived)
→
Italian
digiuno
(derived)
→
Portuguese
jejuar
(derived)
→
Portuguese
jejum
(derived)
→
Romanian
ajun
(derived)