They may not be able to guess whether you in particular or your children are Jewish, but if I can guess your name from your sex, zipcode, and birthdate, I'm pretty sure that there will be many markers of that major a part of your life to someone who examines you at any depth looking for those markers. A major marker will probably be, for example, the lack of any markers of any non-Jewish group, i.e. you're not an obvious Catholic, Muslim, Protestant, etc.

Of course, as a black American, I'm jealous that that's the biggest question that you have.