You can give it almost whatever names you what.
It could be page2.html, next.html, mysecondpage.html or anything that will make sense to you.
To secret is to reference that “next” page correctly in your NEXT button or link.
Example:
Say you decided to go with page2.html.
Upload this page to your public_html directory.
In your index.html your link to this page would be something like this:
HTML:
<a href="http://www.yoursite.x10hosting.com/page2.html">This is a Link to next page </a>