In his mystic interpretation, Mexico could mean "Center of the World," and, in fact, it was represented as such in various codices, as a place where all water currents that cross the Anahuac ("world" or "land surrounded by seas") converge (see image on the Mendoza codex). It is thus possible that the other meanings (or even the "secret name" Mexi) were then popular pseudoetymologies.
According to his mystical perspective, Mexico symbolized the "World's Center," and this notion was reflected in various pre-Columbian texts, depicting it as a place where all sea routes that encircle Anahuac converge (as seen in the Mendoza codex). This might have led to the widespread acceptance of alternative meanings or even a "secret name" Mexi.