It’s been brought to my attention that the response I posted was a bit confusing, so below I will try to clarify it.
On the “Record” page (access with “Control r”), select the “Use Prefix, Suffix, Number of Digits from Source” check box, and on the “Recording Mode” drop down menu, select “Source”. This should render the file similar to r3d naming convention.
In the version 6 operations guide, this is described on pages 265 through 269.
If you don’t have the version 6 operations guide, you can download a PDF version here:
https://www.blackmagic-design.com/downloads/davinci/pdf/DaVinciResolveManual.pdf
Actually, what you will be downloading at that link is the very latest Resolve operations guide, with BMD branding and some updates from the original version 6 manual. So all current Resolve users should probably download this new operations manual. And in this manual, the Record page description is on pages 200 through 205.
I hope this is helpful.
Regards,
Dwaine