This is the 9112th most frequent Spanish word.
wolff
"Wolff" is not a Spanish word. It is likely a proper noun or surname.
In this sentence, 'Wolff' is used as a personal surname, emphasizing its role as a proper noun.
Wolff es un apellido común en Alemania.
Wolff is a common surname in Germany.
Here, 'Wolff' is again used as a surname, this time specifying an individual's title and professional activity.
El doctor Wolff realizó una conferencia en la universidad.
Dr. Wolff gave a lecture at the university.
In this instance, 'Wolff' identifies the last name of a specific playwright, associating it with artistic contributions.