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<?php woocommerce_subcats_from_parentcat_by_NAME('Parent Category Name'); ?>

// Show product category children
function woocommerce_subcats_from_parentcat_by_NAME($parent_cat_NAME) {

$IDbyNAME = get_term_by('name', $parent_cat_NAME, 'product_cat');

$product_cat_ID = $IDbyNAME->term_id;
   $args = array(
       'hierarchical' => 1,
       'show_option_none' => '',
       'hide_empty' => 0,
       'parent' => $product_cat_ID,
       'taxonomy' => 'product_cat'
   );

$subcats = get_categories($args);

echo '<ul class="submenu" aria-label="submenu">';

foreach ($subcats as $sc) {
       $link = get_term_link( $sc->slug, $sc->taxonomy );
echo '<li><a href="'. $link .'">'.$sc->name.'</a></li>';
     }
echo '</ul>';

}