The words Mulongu and Melengo reminded me of a similar word "malunga" thatI saw at the Captive Passages The Transatlantic Slave Trade and the Making of the Americas Exhibit at the Mariners Museum in VA in May of 2002.

The harrowing voyage from Africa to the Americas was the one experience shared by all enslaved Africans, no matter where they came from or how or when they were enslaved. For those who survived, the appalling experience of the Middle Passage forged strong new bonds of kinship. Central Africans who were taken to Brazil used the Kimbundu/Kikongo term "malunga," which roughly translates as "shipmates."

There is a link to the Captive Passages site:
http://www.mariner.org/captivepassage/departure/index.html

Selma

"In recent decades it has become popular to equate Portuguese with Angloan. One author has attempted to claim that the word Melungeon was transported from some Mulongu Mountain in Angola. Neither the Melungu theory nor an origin based on the Gypsy word "Melengo" have met any reasonable standard of proof."