Setup a workflow to automatically split the First and Last names of your MailChimp subscribers' Full Name field.
Use this recipe, submitted by Blair Rorani of Smart Workflow Design, to create a workflow which will split the first and last names of Mailchimp subscribers from one field into two separate fields. Send the data to Google Sheets where you can use a Zap from Zapier to update your Mailchimp subscriber data in real-time. Schedule this flow to run as often as you need to ensure your Mailchimp subscriber data is up to date.