How can I distinguish my last name from my middle name?
In Brazil, we divide our full name into first name and last name, but in English we also have the middle name. It's easy for me to differentiate it when one has only a first name and a mother's last name with a father's last name, but when they have two "first names" like me, Ana Carolina, how should I do it? Is "Ana" as a first name, "Carolina Silva" as a middle name and "Miranda" as a last name or is there another way to do it?
By the way, my full name is Ana Carolina Silva Miranda

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In US English, “Ana” is your first name and “Carolina” your middle name (second given name). Alternatively, I suppose you could say that “Ana Carolina” is a compound first name — I believe this analysis may be typical in Brazil and perhaps the southeastern US. Note that in English speaking countries, traditionally only the paternal last name is used. The maternal last name is called “your mother’s maiden name” and used to be used by banks and such as a sort of “secret” password for verifying an account-holder’s identity.

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Luis is correct, just remember that while Spanish puts the paternal last name before the maternal, Portuguese puts the paternal name *after* the maternal. So a Portuguese speaker would use the second last name in the USA.

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Hi Ana Carolina,

English is very straightforward language. I had the same question when I moved to the US.
First: Ana
Middle: Carolina
Last Name: Silva. (also known as family name)

Unlike latin america, in the US people only use one last name (father last name, women usually change their last name when they get married). You can either omit your second last name or use a hyphen Silva-Miranda. Otherwise, people usually take the very LAST name as the family name.

If you get marry in the US, for example to John Smith, your name will change to Ana Carolina Smith.

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No it would be Ana Carolina as first name. My wife has two first names also