Hi there.
Pip is so cute! [name_f]My[/name_f] husband is [name_m]Paul[/name_m], & while we’re not into juniors, I’ve still thought about this. What I’d call a [name_m]Paul[/name_m] [name_m]Jr[/name_m]. I love [name_u]Pip[/name_u], but also [name_m]Paul[/name_m] nn Patch. 
I’m really tempted to suggest older solid names w/quirky nns.
How about…
Boys-
Arthur nn [name_m]Ace[/name_m]
Albert nn [name_m]Ace[/name_m]/Albie/Bertie
Adam nn [name_m]Ace[/name_m]
Bernard nn [name_m]Ben[/name_m] or [name_u]Bernie[/name_u]
Charles nn [name_m]Chet[/name_m]/Cal/Cab/Chase/Chance/Charlie
Christopher nn [name_u]Kit[/name_u]
Desmond nn [name_m]Dex[/name_m]
Edward nn [name_u]Teddy[/name_u] or [name_m]Ned[/name_m]
Gabriel nn [name_m]Gibby[/name_m]
Henry nn [name_m]Hank[/name_m]
Harrison nn [name_m]Hank[/name_m]
Isaac nn [name_m]Ike[/name_m]
Jerome nn [name_u]Jem[/name_u]
Jeremiah nn [name_u]Jem[/name_u]
James nn [name_u]Jem[/name_u]
Laurence nn [name_m]Lad[/name_m]
Louis nn [name_u]Louie[/name_u]
Martin nn [name_u]Marty[/name_u]
Nathan nn [name_m]Nate[/name_m]
Nathaniel nn [name_m]Nate[/name_m] or [name_m]Nils[/name_m]
Samuel nn [name_u]Sam[/name_u]
Solomon nn [name_u]Sol[/name_u] or [name_m]Solly[/name_m]
Theodore nn [name_u]Theo[/name_u]/Teddy/Thad/Tad/Thatch/Thax
Thomas nn [name_m]Tuck[/name_m] or [name_m]Tucker[/name_m]\
William nn [name_u]Win[/name_u]
Winston nn [name_u]Win[/name_u]
Girls-
Anne nn [name_f]Annie[/name_f]
Beatrice nn [name_f]Bea[/name_f]/Bess/Bette
Catherine nn [name_f]Cate[/name_f]
Cornelia nn [name_f]Cora[/name_f] or [name_f]Nellie[/name_f]
Dorothy nn [name_f]Daisy[/name_f]
Dorothea nn [name_f]Daisy[/name_f]
Emilia nn [name_f]Millie[/name_f]
Eleanor nn [name_f]Nellie[/name_f] or [name_f]Ellie[/name_f]
Ellen nn [name_f]Nellie[/name_f] or [name_f]Ellie[/name_f]
Eloise nn [name_f]Lulu[/name_f]
Estelle nn [name_f]Essie[/name_f]
Esther nn [name_f]Essie[/name_f] or [name_f]Tess[/name_f]
Elizabeth nn [name_f]Ellie[/name_f]/Elsie/Eliza/Bess/Bette/Tess
Frances nn [name_f]Franny[/name_f] or [name_f]Francie[/name_f]
Gwendolen nn [name_f]Gwen[/name_f]/Gigi/Winnie
Georgia nn [name_u]Georgie[/name_u]/Gigi
Greta nn [name_f]Gerty[/name_f]
Josephine nn [name_f]Posy[/name_f]
June nn [name_f]Junie[/name_f]
Jane nn [name_f]Janie[/name_f]
Katherine nn [name_u]Kit[/name_u]/Kitty
Kathleen nn [name_u]Kit[/name_u]/Kitty
Louise nn [name_f]Lulu[/name_f]
Louisa nn [name_f]Lulu[/name_f]/Lula/Lola
Lucille nn [name_f]Lulu[/name_f]/Lucy
Lilian nn [name_f]Lili[/name_f]
Margaret nn [name_f]Maisy[/name_f]/Molly/Maggie/Peggy/Polly
Maureen nn [name_f]Maisy[/name_f]/Molly
Madeline nn [name_f]Maisy[/name_f]
Rose nn [name_f]Rosie[/name_f]
Rosalie nn [name_f]Rosie[/name_f]
Sylvia nn [name_f]Sylvie[/name_f]
Susanna nn [name_f]Sadie[/name_f]/Sally/Scout/Annie
Tessa nn [name_f]Tess[/name_f]
Vivian nn [name_f]Vivie[/name_f]
Violet nn [name_f]Vivie[/name_f]
Hope this helps. 