Mexico's Official Name: Estados Unidos Mexicanos = United Mexican States

Correction: The statement in the question contains an error. "Estados Unidos Mexicanos" does translate to "United Mexican States." It is the country's official constitutional name.

Breakdown

• Estados Unidos = United States
• Mexicanos = Mexican

Thus: United Mexican States.

Usage

• Official documents, treaties, currency, government letterhead: Estados Unidos Mexicanos
• Daily use, media, international relations: México / Mexico
• Short form: México (constitutionally recognized since 2016 reform)

Historical Note

The name was adopted in the 1824 Constitution after independence from Spain, modeled on the United States of America as a federal republic of states. The 1917 Constitution retained it.