This is the 7911th most frequent French word.
sonja
"Sonja" is not a standard French word; it is typically a proper noun, like a name.
Sonja the word remains a proper noun but in this context does not influence grammar or meaning uniquely.
In this sentence, 'Sonja' is used as a proper noun, serving as the subject of the sentence, referring to an individual's name.
Sonja étudie la littérature française à la Sorbonne.
Sonja studies French literature at the Sorbonne.
Here, 'Sonja' illustrates possession, with the sentence indicating ownership of an item with 'Sonja's book'.