// Testing that $_GET['product-cato'] has been requested and that the product category exists.
if( isset( $_GET['product-cato'] ) && term_exists( intval($_GET['product-cato']), 'product_cat' ) ){
    // Get the corresponding WP_Term object
    $term = get_term( intval($_GET['product-cato']), 'product_cat' );
    //Display the term name for the product category
    echo '
' . $term->name . '
';
}