The name of the dish appears to derive from the French touiller, to stir, although the root of the first element "rat-" slang from the French Army meaning chunky stew.

There is a Maltese version of ratatouille called “kapunata”, which is very similar to its French counterpart. Kapunata is made with tomatoes, green peppers, eggplant, and garlic, and goes well with grilled fish. A comparable Spanish dish is called "pisto".

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