Product name is stored in DB with order item details in table sales_flat_order_item
when order generated.
The name will get from the storeview
from which user orders. So it's not available by default.
You have to do customization for this Like :
In file app/design/adminhtml/default/default/template/sales/items/column/name.phtml
the order product name is coming from order item.
Instead of that you have to load that product with the help of product_id
and get and show name from product directly instead of order.
Code
<h5 class="title"><span id="order_item_<?php echo $_item->getId() ?>_title"><?php echo $this->escapeHtml($_item->getName()) ?></span></h5>
Replace with :
<?php $p = Mage::getModel('catalog/product')->load($_item->getProductId());?>
<h5 class="title"><span id="order_item_<?php echo $_item->getId() ?>_title"><?php echo $this->escapeHtml($p->getName()) ?></span></h5>