It's pretty hard to find the exact query to do to get a contact's name , So here's how :

get_contact_first_name.java

    String[] nameProjection = new String[] {
        ContactsContract.CommonDataKinds.StructuredName.GIVEN_NAME,
        ContactsContract.CommonDataKinds.StructuredName.FAMILY_NAME
    };
    final Cursor nameCursor = context.getContentResolver()
        .query(ContactsContract.Data.CONTENT_URI, nameProjection,
            ContactsContract.Data.LOOKUP_KEY + " = ? AND "+  ContactsContract.Data.MIMETYPE + " = ? ",
                new String[] { contactLookupKey, ContactsContract.CommonDataKinds.StructuredName.CONTENT_ITEM_TYPE },
            null, null);
    try {
      if (nameCursor.moveToNext()) {
        String firstName = nameCursor.getString(nameCursor.getColumnIndex(ContactsContract.CommonDataKinds.StructuredName.GIVEN_NAME));
        if(!TextUtils.isEmpty(firstName)) {
          displayName = firstName;
        }
      }
    } finally {
      nameCursor.close();
    }