Hi Gitesh,
For the first question, you can display the manufacturer name by using a custom function in your transformation. See the documentation here:
http://devnet.kentico.com/docs/5_5r2/devguide/index.html?adding_custom_functions_to_transformations.htmIn the function, you can use a SQL query to find ManufacturerDisplayName from the table COM_Manufacturer where the SKUManufacturerID for the product matches ManufacturerID in the COM_Manufacturer table.
For your second question, to change the display name for Manufacturer, follow these steps:
1. In the filesystem for your site, open this file:
./CMSResources/CMS.resx
2. Search the values for the string that matches the one you'd like to change. Note the key for that string (the name property of the data tag). In this case, you are most likely looking for objecttype.com_manufacturer or objecttype.ecommerce_manufacturer
3. Go to Site Manager -> Development -> UI culture and edit the culture you would like this string replaced for.
4. Choose new string, enter the key from above, and add your custom string to the textbox then save.
Best Regards,
Allen Greenhaw