You have more than a blog and want you to want to change the name of the author on your other blog? because your name will appear the same on all your blogs. So to come up with a different name on every blog, you just need to follow this tutorial. It is easy and simple. Let's start :
1. Go to your Dashboard > Design > Edit HTML > Check Expand Widget Templates.
2. Find this code :
<span class='post-author vcard'>
3. Change <data:post.author/> with your desired name.
4. Save your template.
Refresh your blog to see results.