I do think that RISC OS needs a new name. The present one conveys nothing to people outside the RISC OS world and, as has been pointed out, the name Acorn puts a lot of people in mind of the BBC Micro.
(When I went for a job interview in 1993, I mentioned my computing activities and the interviewer said that he didn't realise that Acorn still made computers.)
We've heard about how Castle, with Tematic, would like to use RISC OS in consumer electronics. The operating system needs a brand name which conveys to the average person more of what it is and does and is, preferably, a little easier to say than RISC OS.