not much worse than the real names that jkr showed on her website for Lunas twins with Rolf Scamender. I mean Lorcan and Lysander Scamender? But I could actually imagin Luna naming her child Lucius, a poor victim of the rotfang conspiricy.
Actually she gave some more background later in interviews. You can look on her websites, you can find her complete "pedigree" of Weasleys. What I remember - harry´s kids were really "James Sirius Potter", "Albus Severus Potter" and "Lily Luna Potter". George married Angelina and had two kids, boy named - naturally - Fred and girl called Roxanne. Charlie stayed childless and unmarried. Bill and Fleour had three kids (Victoire being their oldest, born exactly one year after final battle and therefore called "victoire"=victory in french). Neville married Hannah Abott. And Luna married too, though later, but with some foreign guy.