Neville and Hannah were James's godparents. Later, it made sense when he and The Longbottom's eldest daughter, Alice.
Ron and Hermione were Al's, and Rose's were Harry and Ginny. That way, the two best friends would not be separated.
Lily's was Teddy. By the time she was born, he was almost at Hogwarts. They had one of the strongest Weasley bonds ever, and Lily referred to him as her second father.
Hugo's was Luna. It was a thank you for all the crazy things she did.
