It is always okay to change someone's heading based on their personal preference. So if you have corresponded with the author and he told you that he goes by Bill it's completely fine to change his heading. Even if it was already coded RDA you would be able to make this kind of change that is due to the author telling you their preferred form of name.
From: Program for Cooperative Cataloging <[log in to unmask]> on behalf of Kristin Anderson <[log in to unmask]>
Sent: Friday, March 22, 2019 2:39 PM
To: [log in to unmask]
Subject: [PCCLIST] undifferentiated name with another established name heading
I am having a mental block so I wasnít sure what was appropriate for this situation.
Upon doing research and talking to the author I discovered that 2 of the items on the undifferentiated name authority Levy, Bill (no 95043726) were written by Levy, William V. (no2006122877) (authorís real name) but under the name of Levy, Bill. Now the author has written under the name Bill Levy since 1995 and I would like to change the 100 field from Levy, William V. to Levy, Bill, 1930-. I thought since Levy, William V. hasnít been coded to RDA that it might be okay for me to make the changes I want but I wasnít sure due to it being Friday.
Technical Services Acquisitions Librarian
Paul Sawyier Public Library
319 Wapping St.
Frankfort, KY 40601
502-352-2665 ext. 203