His bandmates introduced him as "Rocky" when I saw him.
It's indeed pronounced "rocky", and it came from a contraction of his first and middle names - ROger KYnard Erickson.
The first Elevators album's a classic, but the second one, "Easter Everywhere", is their real masterpiece. All of the existing commercially available Elevators CDs suck, not to put too fine a point on it; there are various fan-traded needledrops from original mono and stereo LPs out there that are much better.
That's a great record, but I haven't spun it in a long time.