In the novel, Nenny, Meme, and Meme's dog all have two names. Why does Esperanza focus on the idea of "two names" so often in the story?

She wishes she had a different name than Esperanza.

She doesn't understand the point of having a nickname.

She thinks her sister Nenny should be called Magdalena now that she is older.

Her Spanish name has no meaning in English.​