How to switch sender's last and first name in email account?

Hi, I've been use BB9900 since it was available in the U.S. But recently I found that the format of sender's name was "Last name, first name" in my email account. For example, if papa johns send me an AD, it shows "Johns, Papa".
I know it's not a big issue, but sometimes it really bother me.
So is there any friend got similar problem? And how to change it?
THX

I finally figured it out. Just go to the 'Setup' --> Language and Input Methods --> change the 'Global Name Display'.

i just go to settings in my contact app and chose first,last to display contacts