This is the 4072nd most frequent Spanish word.
doherty
"Doherty" is not a Spanish word; it is typically a surname of Irish origin.
In this sentence, 'Doherty' is used as a proper noun, referencing a surname.
Doherty es un apellido común en Irlanda.
Doherty is a common surname in Ireland.
Here, 'Doherty' refers to a specific individual, a Mr. Doherty, as part of a formal address.
El señor Doherty nos dio una conferencia interesante.
Mr. Doherty gave us an interesting lecture.
In this example, 'Doherty' identifies a family name, used here to describe an entire familial group.