I've literally said it could be a mixed culture situation. And that I Could keep the name. You're the one who implied letting people know the family speaks Spanish beforehand sounds like you're saying " you better go and make them Hispanic". I did not say you're assuming people should make a Hispanic character. I said the fact that you assume that's what people would think reveals you know the information is something that would affect a person into making a Hispanic character.
You can't pretend this isn't information that affects an MC's identity. Something a lot of people would like to know about their MC before already forming an identity for them. If the family was introduced early on in the story, this would not be a problem.
As I said, it's a premise. All other premises is in the introduction of your story. You don't want to add that premise even as an offhand in the introduction part because you don't want to come off as saying "oh, hey you can speak Spanish so you better go and make them Hispanic". What I've said is it does not do that.