where did this name originate?
From the Nahuatl term for the heartland of the Aztec Empire, namely the Valley of Mexico and surrounding territories, with its people being known as the Mexica.
Mexico
is the Nahuatl term for the heartland of the Aztec Empire, namely the Valley of Mexico and surrounding territories, with its people being known as the Mexica. 
what was the texas revolution? A rebellion of colonists from the United States and Tejanos in putting up armed resistance to the centralist government of Mexico. in which country did the movement originate? Mexico
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Mexico [SEP] Etymology
is the Nahuatl term for the heartland of the Aztec Empire, namely the Valley of Mexico and surrounding territories, with its people being known as the Mexica. The terms are plainly linked; it is generally believed that the toponym for the valley was the origin of the primary ethnonym for the Aztec Triple Alliance, but it may have been the other way around. In the colonial era, when Mexico was called New Spain, this central region became the Intendency of Mexico, during the eighteenth-century reorganization of the empire, the Bourbon Reforms. After the colony achieved independence from the Spanish Empire in 1821, said territory came to be known as the State of Mexico, with the new country being named after its capital: Mexico City, which itself was founded in 1524 on the site of the ancient Mexica capital of Mexico-Tenochtitlan.