On wordpress.com your blog name will be by default set a screen-name of Author, to avoid author selection o import you can change in your profile under My Account a nickname to original blog author name and select to be this one public name:
virtguru -> natiku
If you have more authors just add to blog new users with fixed nicknames
In export file now change your original name to your wordpress login:
AUTHOR: natiku -> AUTHOR: virtguru
Note: Natiku is anagram of my Surname Kutina
See ScreenShots:
