Validate “Name” field

Hi, nuevaenword, I’m another Contact Form 7 user.

You can either pursue this by introducing additional code as seen in this link:
https://contactform7.com/2015/03/28/custom-validation/

Or you can use a plugin that will offer you the ability to ensure letters only be entered into a field like with this plugin: https://www.ads-software.com/plugins/jquery-validation-for-contact-form-7/