Pre-populating the form

Can I pre-populate all the fields of a form with data from excel based on user input field?

For ex: If a user enter their first name in the form, all their related fields for that specific person should be populated in the form.

Yes, that is possible. Please try this Spreadsheet to Form widget. Here's the link: https://widgets.jotform.com/widget/spreadsheet_to_form

Related Link: http://prepopulate.jotform.io/

Please give it a try and let us know how it goes.