Gary?

[BikerDude]

The only guy who is present with the Dude in the presence of the Stranger
and the only other person who the stranger speaks to.

He has 4 lines the last one being "Sorry to hear about Donny."
To which the Dude answers by quoting the first conversation with
the stranger
                                          DUDE
                         Yeah.  Well, you know, sometimes you
                         eat the bear, and, uh.

               "Tumbling Tumbleweeds" has come up on the jukebox, and The
               Stranger ambles up to the bar.

                                     THE STRANGER
                         Howdy do, Dude.

Dude speaks to Gary one more time and does not receive a reply


                                        DUDE
                         Thanks, Gary...Take care, man, I
                         gotta get back.


                                     THE STRANGER
                         Sure.  Take it easy, Dude--I know
                         that you will.

Ends with the Stranger and Gary

                                 THE STRANGER
                         ...Say friend, ya got any more a
                         that good sarsaparilla?...



Gary? Fucking Gary man.

[DigitalBuddha]

Here is the actor dude playing Gary.................

http://www.imdb.com/name/nm0802742/