A while ago a coworker asked me about my lowercase name, and I made an offhand reply which I realized exposed the underlying truth to the story that I had never quite articulated in all these years.
back story 1: I have oft credited myself with the saying, "you can never be the same person twice." This is, of course, an obvious knock-off of "you can never cross the same river twice." The motivation of the idea is that the mind is as ever changing as the river - the self is a fiction, anyway, a convenient point of reference no more "real" than center of gravity (yes, I'm totally stealing from Dennett).
back story 2: my original computer handle was the "silver owl," and then later I changed it to "silver adept" in honor of a close friend. Then I got over my Piers Anthony fixation and dropped the 'adept'. Thus I became just "silver". That's when "Aldo Cella" dubbed me "the silver identity crisis," a handle I never actually used (yes, that was a reference to the old Cygnus BBS of San Antonio).
Anyway. My off-hand reply to my coworker was "because it's not a noun, it's an adjective. An adjective in front of an unspecified (and ever changing) noun." But, actually, had I thought about it originally, that fits both of my pieces of back story incredibly well. I think perhaps it was subconsciously what I meant all along in insisting it not be capitalized.