There are tons of reasons why one might not want to change their name. At a minimum you have to send a form to the state, update any licenses you have, contact your banks, your insurance, your place of work… Best case scenario it’s an annoying hassle to deal with.
Was I appreciative when my wife took my name? Sure. But that’s mostly because we also share the same first name so it’s hilarious to share the same last name. But I told her many times before we got married she didn’t need to do it. I never expected that out of her.
If having a matching name is a big deal with you, then you can change your name.
Puerto Rico is an island east of the Dominican Republic, in the Caribbean. It is considered a U.S. territory.
In the U.S., territories are not equal to nor do they have the same privileges as U.S. states. Notably, they do not have anybody in Congress or the House of Representatives actually representing them.
Due to the electoral college, that also means Puerto Rico cannot contribute to the national U.S. elections in any significant way.