When headlines are (less than) half the story

Sometimes you read a science news headline and your first reaction is “I don’t think so”. That was my response when I read DNA could predict your surname. On reading the article, it becomes clear that “DNA could predict your surname with extremely low accuracy”.
The principle is obvious enough. If you take DNA from Mr X, his father, grandfather and uncles, there’ll be a fair degree of similarity, perhaps enough to say “it’s from the family X”. Where it all falls down of course, as the article states further along, is when adoptions, infidelity, name changes and multiple founders enter the picture. Not to mention the complete lack of application to female suspects.
Not impressed.