Fetching Customer firstName lastName I want to output a list of all orders of all customers, including customers first name and last name. But can't get these two elements. 

What I have now is:

{% set pastOrders = craft.commerce.orders.find() %}
{% for order in pastOrders %}
    {% for item in order.lineItems %}
    &lt;tr&gt;
      &lt;td&gt;{{ order.id }}&lt;/td&gt;
      &lt;td&gt;{{ craft.commerce.customer.firstName }}&lt;/td&gt;
      &lt;td&gt;{{ craft.commerce.customer.lastName }}&lt;/td&gt;
      &lt;td&gt;{{ item.description }}&lt;/td&gt;
      &lt;td&gt;{{ order.email }}&lt;/td&gt;
      &lt;td&gt;{{ item.options.evenement }}&lt;/td&gt;
      &lt;td&gt;{{ item.note }}&lt;/td&gt;
      &lt;td&gt;{{order.orderStatus.name}}&lt;/td&gt;
      &lt;td&gt;{{ order.datePaid.localeDate() }}&lt;/td&gt;
    &lt;/tr&gt;
    {% endfor %}
  {% endfor %}


But as you may guess, I've got an error in both fields firstName lastName
Not all orders will necessarily have a craft user associated with the order.

But all orders must have a billing address, so:

order.billingAddress.firstName and order.billingAddress.lastName will get you what you need.