Erroneous (Alex Dmochowski)
From Zappa Wiki Jawaka
Erroneous, aka Alexander "Alex" Dmochowski, provided bass for Waka/Jawaka, The Grand Wazoo, Apostrophe ('), The Lost Episodes, and Quaudiophiliac, credited as 'Erroneous'. Speculation as to the psudonym, the best being that Alex was working in the states without a green card at the time, and the most likely because his record company wouldn't give him permission to record on another label using his real name.
He had previously played with Aynsley Dunbar's Retaliation.