This is a great thread and I've totally enjoyed chuckling at everyone's great nicknames.
Mona's official name: Princess Mona Lisa Laurens-Ficcaglia of Darmstadt, Germany (I have a old friend that lives there).
Unofficial names: Momo, Mona Lisa when she's in trouble, Momozel Kahpolzel, Stink-a-butt...I think that's pretty much it.
Jackson - Jack, Jack O' Latern, Poop tail Rogers, Mr. Boogalooga... lots more
Brandi - Branders, Mrs. Branderson, girlie
Daisy - Daisy Daze, Baby, Devon (Blech - her original name)
Stuart - Stuart Bob o' lou art, Stu Fart, Stu baby
Cash - Cashman, Cashy, Cashy Fontaine