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Adjective that is formed from proper noun is called proper Adjective. Proper adjectives are derived from proper nouns and are almost always capitalized. e.g. Distributive Adjective. Degrees of Adjective.
Taking a look at another example: Adjectives may even change meaning depending on whether they precede or follow, as in proper: They live in a proper town (a real town, not a village) vs. They live in the town proper (in the town itself, not in the suburbs). That's why they are sometimes used after the nouns proper.