Rename WooCommerce "Brands" to "Manufacturers"

rename-woocommerce-brands.php

<?php
/**
 * Rename WooCommerce "Brands" to "Manufacturers"
 *
 * @param array $args
 *
 * @return array
 */
add_filter( 'register_taxonomy_product_brand', 'woocomerce_brands_filter', 10, 1 );
function woocomerce_brands_filter( $args ) {

	// Change the labels
	$args['label'] = __( 'Manufacturers', 'custom' );
	$args['labels'] = array(
		'name'              => __( 'Manufacturers', 'custom' ),
		'singular_name'     => __( 'Manufacturer', 'custom' ),
		'search_items'      => __( 'Search Manufacturers', 'custom' ),
		'all_items'         => __( 'All Manufacturers', 'custom' ),
		'parent_item'       => __( 'Parent Manufacturer', 'custom' ),
		'parent_item_colon' => __( 'Parent Manufacturer:', 'custom' ),
		'edit_item'         => __( 'Edit Manufacturer', 'custom' ),
		'update_item'       => __( 'Update Manufacturer', 'custom' ),
		'add_new_item'      => __( 'Add New Manufacturer', 'custom' ),
		'new_item_name'     => __( 'New Manufacturer Name', 'custom' )
	);

	return $args;
}

For those who don't already know, add this code to your themes functions.php file for implementation