The Era Aviation helicopter last reported in Tuesday night as it ferried two pilots and eight contractors to a drilling ship in the western Gulf of Mexico.
Among the items found floating Wednesday about 60 miles south of Galveston was an Era life jacket.
The Galveston County Medical Examiner's Office identified the bodies as helicopter pilot Tim B. O'Neal, of El Lago, Texas; co-pilot Donald J. Janning, of Monument, Colorado; and contractors Trampas Terwillegar, from Rayne, La.; and Tyler Breaux of Houma, La.
Among the six still missing were contractors Jason Petitjean of Rayne and David Kamolsiri of Houston. The names of the other four passengers have not been released.
More debris was discovered Thursday morning in the search for the twin-engine helicopter, a Sikorsky S-76-A.