[SalesForce] Error: Compile Error: Illegal assignment from String to SOBJECT:Account

I have created a custom field in custom object, in that i am getting the value and when clicked custom button "convert" which is create a new contact. But when converting i am getting this error.

Error Message:
Error: Compile Error: Illegal assignment from String to SOBJECT:Account at line 37 column 9

Code:

public class LeadConversion {
 public PageReference RedirecttoLead()
 {
    String currentLead = '/' + siteObj.Id;
    PageReference pageRef = new PageReference(currentLead);
    return pageRef;
 }

 private Site__c siteObj;

 // The extension constructor initializes the private member
 // variable acct by using the getRecord method from the standard
 // controller.
 public LeadConversion(ApexPages.StandardController stdController)
 {
  System.debug('******sai******');
         siteObj = (Site__c)stdController.getRecord();
 }

 public void convertLead(){    
    Contact cc = new Contact();
    cc.LastName = siteObj.LastName__c;
    **cc.Account = siteObj.Name;**

   try 
   { 
    insert cc; 
   }
    Catch (Exception ex2)
    {

     ex2.getmessage();
    }     
 }    
}

Kindly anyone tell how to solve this issue.