Import all data like users, post, comments etc to multisite

I have wordpress blog site and I am migrating it into WordPress multisite. We have more then 4000 users and approximate 3000 post and comments.

My requirement: Every existing user have their blog automatically. Like user jay have their blog example.com/jay or jay.example.com with their existing posts, pages and comments.

Example:
Suppose my blog website(not wp multisite) is http://www.myblogsite.com with 100 registered users.
raj, jay, rahul, tony etc etc.

User raj have 10 posts, 2 pages and 5 comments.

All post of user raj are showing on myblogsite.com/author/raj url.

Now, I want to migrate wp single site to wp multisite.

Then raj got thier blog automatically and url would be myblogsite.com/raj and all posts of raj showing there and pages as well.

My Question: Is there any plugin or script to export data from wp single site and import it into wp multisite so all users get their blog automatically with posts, pages and comments.