I've done this for myself before but not the kids.

Me: Sloopy Dippin Dunkin
Bruce: Dipsy Potty Shorts
Taz: Zippy Dippin Dunkin
Zoee: Crusty Potty Shorts (oh, that's not good) I gave her Bruce's last name.
Paizly: Dorky Dippin Shorts (I used part of my last name and part of Bruces)
Taggart: Dumbo Potty Dunkin (same as Paizly with the last names just reverse)