Maybe "deadname" isn't the right term, at least in my case.
That was me, in a former life (a series of them, in a way). But I've pupated and hatched now; my wings are drying and I'm figuring out how to use them.
It's a shame that "caterpillar name" and "butterfly name" are such unwieldy terms because, at least in my case, they're so poetically apt.