There are two to possible this.

Way 1: If you want to change the shipping address fields as well as billing address fields, you can do via theme transaction if you have made a custom theme as per your language.

If you have a custom or third party theme:

You might find a CSV file there. If you have kept locale as English(United States) which is a default one, there will be a file named en_US.csv


Without theme:

Copy locale’s csv file from /vendor/magento/module-checkout/i18n folder to app/code/Magento/module-checkout/i18n directory.


"First Name","Volunteer First Name"
"Last Name","Volunteer Last Name"

Way 2: If you change made in shipping address fields only, Please override LayoutProcessor.php

Step 1 di.xml

path: app/code/vendor/module_name/etc

<?xml version="1.0"?>
<config xmlns:xsi="" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
    <type name="Magento\Checkout\Block\Checkout\LayoutProcessor">
        <plugin name="Custom_Checkout" type="vendor\Module\Block\LayoutProcessor" sortOrder="100"/>

Step 2: LayoutProcessor.php


         public function afterProcess(
        \Magento\Checkout\Block\Checkout\LayoutProcessor $subject,
        array  $jsLayout
    ) {
            ['children']['shippingAddress']['children']['shipping-address-fieldset']['children']['lastname']['label'] = __('Recipient lastname'); 

            ['children']['shippingAddress']['children']['shipping-address-fieldset']['children']['region_id']['label'] = __('Division'); 

        return $jsLayout;

It’s work like charm


Another Way

According to this topic How do you edit checkout field labels in Magento 2? (sorry, wouldn’t let me post as comment)

Translation for State/Province and Zip/Postal Code is found (by default) in /vendor/magento/module-checkout/i18n directory.

You can copy locale’s csv file from /vendor/magento/module-checkout/i18n folder to app/code/Magento/module-checkout/i18n directory.

Then find the text and change its translation.

After saving file, don’t forget to remove content from /var/cache folder and /var/page_cache folder.

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