Possible to make the last name as a required field ?

Hi there, Naveen!

It most certainly is possible, using this custom snippet from our snippet library:

https://github.com/WordImpress/Give-Snippet-Library/blob/master/form-customizations/require-last-name.php

If you need assistance adding custom PHP to your site, we have this article: https://givewp.com/documentation/resources/adding-custom-functions-to-your-wordpress-website/

?Thanks for using Give! Have a great day.