Can I import my guest list into the RSVP form so that when a guest enters their name it pops up?

Alternatively, I want to make sure that if a guest tries entering a name that isn't on this imported guest list file it won't allow them to proceed.

I know that some people suggest using the conditional logic software, but I would have to create about 75+ of those to cover my guest list, and I want to streamline the process. 

Thanks!

You can limit form submission based on a unique question, please check this guide: https://www.jotform.com/help/223-How-to-set-Form-Limits-Based-on-a-Unique-Question 

On regards of importing submission into your form, if you have the data in a CSV file, you can import into your form as shown in the following guide: https://www.jotform.com/help/308-Import-App-Easily-import-your-Excel-or-CSV-data-into-JotForm