James: Simply 'Elvendork James Potter' It's perfect for a boy or girl, if it was a girl, her middle name would be Lily, after her mother of course.
Sirius: Something cool, like 'Fleamont' or' Euphemia'. No! Not after James' parents, umm*cough* definitely, definitely not.
Remus: Well I for one would not name my child something that literally means 'wolf John wolf' because that's stupid and a recipe for disaster now isn't it? I don't think I'd be very good with children.
Peter: Whatever my wife wants, I'm not the one pushing an actual human out of my vagina so I don't think I should have much of a say in it, but I do quite like the name 'Erica'.
Many thanks to @PJHOOHPHGalways (It won't let me tag properly, I hope you see this) for this idea bc It's awesome