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here the steps:
1. copy /components/com_community/templates/jomsocial/layouts/register/base.php to /templates/socialize/html/com_community/layouts/register/base.php (create the folder if not exist yet under socialize template)
2. edit that file and remove this code from line 21 - 43
3. and you need to put custom code at jomsocial core file. but every time you upgrading your jomsocial, you need to re-apply this changing again. please edit:
/components/com_community/controllers/register.php around line 70, find this code
// Get required system objects
$config = CFactory::getConfig();
$post = $jinput->post->getArray();
I just realized really all I needed to do was edit the language file to read 'Display Name' instead of 'Name' and just trick the user into putting what they want to be shown on their profile.
I would suggest making this an option in a future release though. Lots of people need this option.