The exact identity of Cabranez and the meaning of the egg breaking in his pocket are unknown.
In a recent letter Eva Hesse suggested several possibilities all based on the fact that since Pound was working from memory at Pisa he could have misspelled the name. Of these possibilities, I prefer her suggestion that Pound intended the French Anthropologist, Dr. Augustin Cabanés [1862-1928] for two reasons: (1) Cabanés' research concerned strange sexual customs in history, a subject which rhymes with Bunting's tales of his 'life in the Canaries.' .... (2) Pound knew the work of Cabanés.
--Terrell, Carroll F. "Cabranez, The Mystery Man" Paideuma 11:3 pg.451.