Magento2 add customer name to Contact Form Reply-To header

di.xml

# etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <preference for="Magento\Contact\Controller\Index\Post" type="path\to\your\Post" />
</config>

Post.php

# path/to/your/Post.php

<?php
class Post extends \Magento\Contact\Controller\Index
{
    public function execute()
    {
        ...

            ->setFrom($this->scopeConfig->getValue(self::XML_PATH_EMAIL_SENDER, $storeScope))
            ->addTo($this->scopeConfig->getValue(self::XML_PATH_EMAIL_RECIPIENT, $storeScope))

            // added second parameter here for the name
            ->setReplyTo($post['email'], $post['name'])

            ->getTransport();

        ...
    }
}