What'up with their kids names and some other questions?

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I finally finished book 7 today. I got the book when it came out, of course, but never read it. I harrowed it on audio book from the library? Just my luck to re-excited about a fandom, as they say in geek speak, that will have no new material ever. I loved the epilogue. Ginny and Harry have three kids and Hermione and Ron two. I never understood the names of theirs? Lilly, James, and Albus make sense, but Rose and Hugo? I'm a missing a connection. Any ideas. I also wonder if Neville got married (do Hogwarts teachers even do that?). If so, I hope he married Luna. I wonder how George is managing without his other half? Any thoughts as to your own ideas about what happened next will soothe this writer's aching curiosity. Sadly, I cannot explore these ideas by writing my own words, because of copyright. Maybe, I write an American wizard story or create a fanfic for Nanowrimo just to get it out of system.