Here's an example on how to do it dynamic. It's not that complicated and it could become a stored procedure on itself.

DECLARE @LastName nvarchar(100) = 'Tamburello',

@FirstName nvarchar(100) = 'Roberto'

DECLARE @Command nvarchar(4000)

SET @Command = 'bcp "EXEC TEST.dbo.spTryOut @LastName='

+ QUOTENAME(@LastName,'''')

+ ', @FirstName='

+ QUOTENAME(@FirstName,'''')

+ '" queryout "D:\SQLServerResults\'

+ @LastName + @FirstName + REPLACE( CONVERT(varchar(19), GETDATE(), 120), ':', '')

+ '.csv" '

+ '-c '

+ '-CRAW '

+ '-S YourServer\AndInstance '

+ '-T '

+ '-t,'

EXEC xp_cmdshell @Command;