Strikes me that Emma is already short enough...but, if you insist... LOL...

You can call me Emma
You can call me Em (very en vogue)
You can call me Ma
You can call me Mmmm

You can call...don't call me, I'll know when din din is on the table and I'll be right there...LOL

On the other hand, you might call her "Honey"...might make for some interesting times...