It would come as no surprise that I voted for "Perl 6". It is the current name and I think it is a fine name, a proper name, a name that has served well, and a name that is getting more and more recognized. Also, it is the name that was chosen by Larry Wall, and the whole world can jump through hoops, and up and down, but Larry has indicated several times that he does not want to change the name.
As for marketing potential: changing the name of Perl 6 to anything else means a defeat. As a marketing strategy, it is devastatingly bad. Everybody will immediately understand that the name change is merely done as an attempt to gain marketing potential.