Unable to change author name in an ebook on iPad
After hours of frustration, I finally found a solution to my problem by doing the following: 


Open Finder.
Click Go in the Finders menu and select Go to Folder.
Type ~/Library/Caches in the window currently displayed and click Go.
Locate the iBooks file and move it to trash. 
Airdrop the same ePub file to iPad.


Following these steps I was able to see the accurate and updated author name on my iPad.