A less flattering, though possible, interpretation is based on deception. An "Indian summer" is a false summer—a brief, misleading return to warmth before the real, unrelenting winter begins. In early colonial times, "Indian" was sometimes used as a descriptor for something fake or spurious (e.g., "Indian giver," a term now rightly considered offensive). Under this theory, the name implied that the warm weather was a "fake" summer, just as a mirage is a fake lake.
The precise origin of the term is not definitively documented, but the most widely accepted theory connects it to early Native American tribes, specifically in the northeastern United States. There are three main lines of reasoning: why is it called indian summer
In summary, while the exact origin is debated, the name most likely honors the observation and use of this weather phenomenon by Native American tribes who actively hunted and gathered during this final, brief return to warmth. A less flattering, though possible, interpretation is based