This is the 746th most frequent Romanian word.
marius
"Marius" is a Romanian male given name, derived from the Latin "Marius," meaning "male" or "of Mars" (the Roman god of war).
In this sentence, 'Marius' is used as a proper noun, the name of a person, who is the subject of the sentence.
Marius merge la magazin.
Marius is going to the store.
Here, 'Marius' indicates possession; the book belongs to Marius, showing the genitive case through the possessive article 'lui'.
Cartea lui Marius este pe masă.
Marius's book is on the table.
This use introduces 'Marius' as an identifier, explaining the name of a person in a descriptive context.