Oh Goodness, I have so many nicknames and I call them couple names too.
Hallie: Hallie bananahead, hallie loo who, hissy fit hallie, baby girl, monster, hallie ann, mustang hallie, cotton ball,
Simon: the Simonator, Simester, monster, Simon Samuel, spumone, Little Man, Si-Si, Sassy
for both of them I call them: Bonnie and Clyde, Monkeys, Fluffy Bugs, Sonny and Cher, Babies,
I know there are a ton more that I can't remember right now
and yes I talk to them in silly voices too!