Oh god, I mean... what if your child doesn't have any children? what if your child decides to take her husband's name, or is a boy who goes on to marry a woman who takes his name? What if your child's child's child ends up with 17 names or none ...What, to quote, Alan Partridge, if your arm bursts? I'm sure the child can work it out when the issues arise! You can only name one generation at a time, and Georgeson-Johns is a perfectly fine and nice surname!
All this endless 'what-iffing' is just a way to make it seem ludicrous for a woman to have a stake in her child's surname, I think.