Portuguese people are White/Southern European like the Spaniards, Italians, French and Romanians. Portugal could NEVER be considered Hispanic in modern age since the Iberian Peninsula was divided into 2 parts: Lusitania for Portugal and Hispania for Spain.
A surname is part of a personal name that is passed from either or both parents to their offspring. Customs on the format of surnames change from region to region and their use has changed over time. In most Western nations, the surname occurs at the end of a personal name, after a given name or names.
Last Name is the surname or the family name in WE and NA. In South Asia, the surname might sometimes be the community or the caste name or a father's or husband's name. So, everyone in the family will have the same last name. (Unless, the spouse does not change the last name after marriage).