pewc_child_product_title.php

<?php
/**
 * Remove attributes from product names of variation child products
 */
function demo_filter_child_product_title( $title, $child_product ) {
	if( ! is_object( $child_product ) || is_wp_error( $child_product ) ) {
		return $title;
	}
	if( $child_product->get_type() == 'variation' ) {
		$parent_id = $child_product->get_parent_id();
		$parent_product = wc_get_product( $parent_id );
		$title = $parent_product->get_name();
	}
	return $title;
}
add_filter( 'pewc_child_product_title', 'demo_filter_child_product_title', 10, 2 );