Is there any way to pre-populate the picklist with the names of the employees?
Two ways you can do this:
1) Use a dropdown question type, where all of the options are the names of your employees, optionally with an “Other, specify” option to account for new hires.
2) Use a textbox question type with Auto Suggest validation, where the Auto Suggest list is the names of the employees.
In both of the above, you’ll need to make sure that you update the options whenever someone is hired or terminated. I have yet to figure out whether it’s possible to avoid having to manually update the options.