Combine and Process Multiple Data Elements into a Custom Export Field - WP All Import
Create custom user fields
Merging First/Last name into One Field - UX Pickle
Adding custom fields to signup form - Questions - Okta Developer Community
Full name” vs “First/Last name” UX Best Practice, by Amir Khademi
forms - Merging firstname/last name into one field - User Experience Stack Exchange
Split names in Excel: separate first and last name into different columns
Create custom fields for first and last names
WordPress Newsletter Plugin: Bloom Subscribers
How to use Mail Merges and how they can benefit your Campaign – Concep