Hi Brian
It will be a little time consuming, but here is how you do it.
1) Make a recording for each name you want to implement. Do this using the 'Record Note' in the 'Voicemail Inquiry' feature. On a SwyxPhone this is the first option you get when lifting the handset without dialling any number. If it is not set up correctly, you will get a message saying that no access to your inbox is possible. Ignore this, not important. When this message is finished, you will get into the main menu. Press 5 to record a note. Here you will read the name of the user. This will be sent as email to the address configured for the user you used when recording. Of course you can also use the Recorder in Windows and save the file.
2) After you have saved all the files for all the users, you will need to start the 'Recording Wizard' in SwyxIt! (Settings -> Recording Wizard...)
3) Click Next
4) On the Own Name page, press the 'Browse' button ( ... ) and select the file you recorded for this user. The voice file will now be imported and used as Own Name for the user.