How Do You Pass In Multiselect Parameters Into a Stored Procedure?

declare @names varchar(200);

set @names = 'Dan, Dirk';

SELECT TOP 1000 [USER_KEY]
      ,[SECURITY_ID]
      ,[USER_FIRST_NM]
      ,[USER_LAST_NM]
      ,[USER_EMAIL]
      ,[ACTIVE_IND]
  FROM [BRAC_Portal].[dbo].[PORTAL_USER]
  where [USER_FIRST_NM] IN ('' + @names + '')

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