Woocomemrce product name on checkout title

I want to show product name in checkout page title.

Something like this: Checkout - Product name.

My woocommerce shop is set to sell only 1 product.

When client click to buy a product, he go directly to checkout page.

I know that this code from review-order.php show product name:

<?php echo apply_filters( 'woocommerce_cart_item_name', $_product->get_title(), $cart_item, $cart_item_key ) . '&nbsp;'; ?>

But I dont know how to use it to show product name in checkout title.

via Chebli Mohamed