When installing Drupal, can (or should) the site name be one word, have spaces or be Camel case?

I am installing Drupal to create a single instance of a new website on my local Windows 7 PC under XAMPP. One of the Drupal instalation screens, I think the third, asks for the site name. Which of the following three formats can, or should, be used:

One Woman Training (three words title case with spaces)
onewomantraining (all one word and all lower case)
OneWomanTraining (one word with Camel case)

After the site is setup, can this site name (whatever it is) be changed?


Drupal version: 

Source: https://www.drupal.org/taxonomy/term/1/feed