Band Aid, Frisbee, and Velcro are on the list which is still legally protected as trademarks. However, in some jurisdictions, they are sometimes also used by consumers in a generic sense. Unlike some other names, these protected names although they are widely known by the public as brand names, are not used by competitors. It is the term mayonnaise that is not a recognized trademarked name or used for similar products that are generically known to the public.

Even when the names “band aid”, “frisbee”, and "velcro" are used as a generic term, they are really trademarked brand names protected under the law. Johnson & Johnson is the trademark owner of the trademarked name Band Aid. Its generic name is adhesive bandage. Wham-O is the owner of trademarked name Frisbee. The generic name for this item is flying disc. The trademark owner of the trademarked name Velcro is the Velcro company. When used generically, it still is trademarked. It is often used as a verb.

The word mayonnaise is used for a sauce made from egg yolks, oil, and vinegar. The term was first used in France in 1815. It referred to a 1806 French sauce which was said by French sources to be corrupted from mahonnaise. It had been named in recognition of Mahon, a seaport capital of the island of Minorca. The sauce was introduced either in commemoration of a navy victory, which was led by Armand de Vignerot du Plessis, duc de Richelieu (1696–1788), or because it was brought to France from there by him.

More Info: en.wikipedia.org