Q: Change File Name of Home

http://support.apple.com/kb/HT1428?viewlocale=en_US&locale=en_US

Wise decision

Propbably, at some point, you'll decide to re-install and you'll have the opportunity to do it then.

You can always create a new admin account, transfer any data to the new account, then delete the old account

Click below:

http://docs.info.apple.com/article.html?path=Mac/10.6/en/8235.html

Reinstall your OS, why would you want to use a machine with some other persons installation on it, maybe he left a keylogger on it, maybe it had other malware ....

Start again and make it your MBA.

Create the new account per that link.

Give it Admin privileges

Transfer files (see below)

Then delete the old account

Transferring files from one account to another on the same Mac

You can use your Shared folder:

1. Log in to the account you wish to copy files from.
2. In the Finder, navigate to the Shared folder.  It is located in the Users folder.
3. Copy any files or folders you wish to the Shared folder, such as items on your desktop, in your Documents folder, in your Music folder, and so forth. You may be asked to enter an administrator password when copying certain items. Note: To ensure that you copy items (as opposed to moving items), hold the Option key as you drag files to the Shared folder.  Depending on item permissions, some files or folders will copy by default, some may move by default.
4. Log out of the current account.
5. Log in to the new account (that you are transferring files to).
6. In the Finder, navigate to the Shared folder.  It is located in the Users folder.
7. Copy any files or folders you wish from the Shared folder to the desired locations, such as desktop, Documents folder, Music folder, and so forth. You may be asked to enter an administrator password when copying certain items.