Examples:
cartography
card
archaeology
archetype
monarchy
legal
loyal
purse
personal
cinema
kinase
car
carpenter
hippopotamus
Mesopotamia
dative
data
date
...
Galician
trinta
←
Latin
trīgintā
(inherited)
←
Old Portuguese
trinta
(inherited)
←
Old Portuguese
treinta
(mention)
←
Old Portuguese
triinta
(mention)