Hot —> Trazom.
Source: npl-folk email from Trazom.
None.
My nom is the obvious reversal. The interesting thing though is that it was he who came up with it, not I. Cf. E. Winternitz: “Gangflow [sic] Trazom: An Essay on Mozart's Script, Pastime, and Nonsense Letters,” in _Journal of the American Musicological Society_, vol. xi (1958), p. 200.
I've combiflatted with Hot, Qaqaq, Xemu, Beacon, and once erroneously with Aesop (turned out the base had come from Plaid – I forgot). Maybe others, I'm not sure; I don't do much of it. But no interesting stories really. All the combinoms have been boringly orthodox except HOTTOTRAZOM.
Pronunciation: TROT-sum.