You can use the Name checker to check whether the name you have chosen is already in use. If you do not check this and it later appears that your trade name or brand name is (almost) the same as that of another entrepreneur, this could lead to confusion and that is prohibited. The Name checker allows you to search using a single search request in the Chamber of Commerce Business Register and in the BOIP Trademarks Register. These registers contain all the trade names and trademarks that have been registered.