It does however back up this mention that I found:
dave_mil...@adobeforums.com
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More options 6 Jul 2004, 20:16
There are two tales surrounding the creation of the name "R2-D2". The first, and oldest, story is that George Lucas was doing the editing on American Graffitti, and was a bit tired in the evening, so he tried to shorten his work by not calling for "Reel Two, Dialogue Two", but for "R2-D2". This version was narrated in the Making of The Empire Strikes Back. When the Annotated Screenplays came out however, Lucas personally corrected this story and said that all names in the movies were selected just to have phonetically pleasing and easy-to-speak names.
XD
Perhaps Darth Neo can confirm this for us.
Cheers
JD