Ok, the namebanks are full of nicknames. Choose the nicknames for each family member and then come up with a full name to go with it. If you would rather just use the nickname, go for it! You may change nickname spellings (these are the ones Nymbler gave me). Middle names are up to you, or you can use the nicknames as inspiration.
DH:
DW:
DS:
DD:
DS/DS:
DD:
DS:
DS:
DD/DD:
DD:
DS/DD:
Girls: Addy Allie Angie Annie Belle Beth Betsy Betty Billy Cora Della Edie Effie Eliza Ellie Elsie Emmy Essie Etta Florrie Flossie Frankie Georgie Gracie Hattie Hettie Jennie Jessie Jo Josie Kate Kathy Lettie Lily Lola Lucy Lulu Maddie Maggie Maisie Margie Mattie Meg Mia Millie Mina Missy Molly Nell Nora Patty Penny Polly Poppy Rosie Sadie Sallie Sandy Sue Tess Willa Willie Winnie
Boys: Abe Al Alex Andy Archie Art Barny Ben Bert Billy Bobby Bram Cal Charlie Chet Chuck Clem Danny Dave Del Denny Don Ed Eli Ernie Finn Frank Fred Gus Hal Hank Harry Herb Ike Jack Jake Jem Jimmy Joe Kenny Kit Larry Len Les Lou Luke Marty Matt Mel Mike Nat Ned Nick Pat Pete Pip Rollie Ron Sam Sandy Skip Steve Teddy Thad Timmy Tom Wally Walt Wes Willy Woody Zed Zeke