The details shared here apply to the most recent versions of our themes. To keep your theme up to date, check out this helpful document.
Within the built-in Newsletter Popup, you can add in name fields through the theme settings.
Turbo/Parallax/Retina/Mobilia/Responsive: To enable the newsletter popup head into Customize > Theme Settings > Popup/Newsletter. You can check off 'Enable Popup' and configure your popup here.
Flex: To enable the newsletter popup head into Customize > Theme Settings > Layout > Show Popup. Once the popup is enabled, a 'Popup' section will appear under Sections in your Theme Editor (customize) at the very bottom.
Artisan: To enable the newsletter popup head into Customize > under Sections > scroll down to Popup.
The popup settings include the ability to add a heading, text, an image, and the newsletter form. To enable the name fields, you'll want to check off 'Show first name' and 'Show last name.'