Maintain the post order according to category name in WP_Query?

No. All available orderby options are listed in this Codex section. what is it that you are trying to do? List posts according to categories – ie Cat 1 posts followed by Cat 2 posts etc?

Yes exactly. I want to order posts by category something like this
cat1
post1
post2
post3
cat2
post1
post2
post3
—
—
Is it possible by using simple wp_query() or i have to get the categories then loop through the category id. But in this case i have another issue with pagination.

You’ll need to use the second option – grab the categories and then step through them launching a new query & Loop for each category. And, yes, I can see how that’s going to create a pagination issue but I don’t think there’s any other way of doing this.

Thanks for your support esmi.

I have the same problem but I have got the posts by category. Still facing issue for paging.

??