This is the 6652nd most frequent Japanese word.
ノナ
"ノナ" does not have a standard meaning in Japanese and might be a name or a stylized word.
In this context, ノナ (Nona) is used as a proper noun to indicate the name of a person.
これはノナの本です。
This is Nona's book.
Here, ノナ (Nona) is again a proper noun referring to a specific individual.
彼はノナが好きだと言いました。
He said that he likes Nona.
In this case, ノナ (Nona) is used figuratively to draw a comparison, potentially alluding to an admired person.