all the college teams have their own names that they call themselves. it is their own distinct identity.
i went to the university of southern mississippi. our team is called the golden eagles.
university of texas calls themselves "long horns".
university of florida: gators
Louisiana State University: tigers
and so on.
and similarly all the pro NFL teams have their own distinct identities. pittsburgh steelers, new orleans saints, new england patriots and so on.