Legal name

In case of Partnership firm/Company :

Legal Name of Business (as per PAN)                       - YOUR COMPANY NAME
Legal Name of Business(as per current tax Act)        - YOUR COMPANY NAME
Trade Name                                                                - YOUR COMPANY NAME

If you heve wrongly displayed your director's name. Then you can go to change it on Amendment Section...

Only online - You can mail to GSTN helpdesk -  helpdesk @ gst.gov.in