Notice how the Latin Vulgate has 1, 2, 3, and 4 Esdras.
The King James changes the name of 1 and 2 Esdras to Ezra and Nehemiah. Then the KJV also changed 3 and 4 Esdras to 1 and 2 Esdras. This causes people to confuse 1 and 2 Esdras in the KJV with the 1 and 2 Esdras in the Latin Vulgate. But...