How to add month name in different columns with respective records sql?

DECLARE @month INT
SET @month=1

SELECT 

    CLOI_ClientOrderItems.cl_Id,

    NoOfInv = SUM(CASE WHEN DATEPART(mm, in_date_issued) <= @month
                        AND DATEPART(yyyy, in_date_issued) = 2014
                       THEN 1 ELSE 0 END),

    MonthTotal = SUM(CASE WHEN DATEPART(mm, in_date_issued) <= @month 
                           AND DATEPART(yyyy, in_date_issued) = 2014
                          THEN in_total ELSE 0 END),

    Grandtotal = SUM(in_total),

    RemainingAmount = SUM(in_total) - SUM(CASE 
                          WHEN DATEPART(mm, in_date_issued) <= @month 
                          THEN in_total ELSE 0 END)


FROM (SELECT 
          DISTINCT MasterOrderId, cl_Id 
      FROM 
          CLOI_ClientOrderItems) as CLOI_ClientOrderItems 

INNER JOIN 
      IN_Invoices 
ON
      IN_Invoices.MasterOrderId = CLOI_ClientOrderItems.MasterOrderId
GROUP BY 
  CLOI_ClientOrderItems.cl_id

noofinv |amt      |clid       | grandtotal |   jan         |feb     |march  |remainingamt
---------------------------------------------------------------------------------------------
5       |7.00     |100000_Pri | 245.00     |   0.00        |238.00  |7.00   |238.00
12      |2510.12  |100001_pro | 181110.29  |   138891.92   |9708.25 |510.12 |178600