Why was the country of Brazil named Brazil?

Briefly, there are many theories.  Some say it was named for the Brazilwood tree or the Brazil Nut tree but then the question remains, what did the word signify?  One source said the inner wood of the Brazilwood tree is red and appeared as a glowing ember so the name came from the Portuguese word for ember, brassa.  I find it unlikely that this land was named after a tree or the characteristic of a piece of wood or a nut but rather the nut or tree was named after the land. 

Seán Mac Mathúna has written a reasonable argument for a Celtic origin, tracing it back to Bresil,  a magical realm - neither sea nor land off the coast of Ireland. Bresil is speculated to be "named after Bres, the son of Ériu whose father was a Formorian sea god, Elatha."  I think he is in the right track but then the question remains, where did Bres get his name and what does that name mean?  And why would Bresil be named for him?

There is another theory that in a sense unifies all these ideas:  

Brazil in antiquity was visited by progenitors of the Celts possibly during the reign of King David.  The land was then named Brazil (Brasil) by a seafaring, merchant people after the massive iron deposits were found  in Brazil.  Still today the most productive iron mine in the world is located in Brazil.

The Hebrew word for iron, brass and bronze according to Isaac Moseson is ברזל 

ב ר ז ל                                                                    

        Transliterated Bet-Resh-Zayin-Lamed  or B R Z L.  

Hence these seafaring merchants may have 70called it BaRZeL or BRaZel pronounced bar-SZ(EL) or bra-SZ(EL) and this is the source of the Portuguese Brasil and the English Brazil.

At this point it we can explain where the brazilwood and brazil nut designations came from.  Brazilwood is dense wood with the core color similar to iron oxide.  Another tree, the Brazil Nut tree has iron-like shells, these nuts present tire hazards if driven over. Bolivia is actually the greatest producer of these nuts, yet even there they are often called Brazil Nuts (nuez de Brasil)

Conclusion:  BRAZIL= THE LAND OF IRON



Sources:

http://www.etymonline.com/index.php?term=brazil

http://www.brazil.org.za/etymology.html

http://www.fantompowa.net/Flame/brazil.htm

http://www.edenics.net/english-word-origins.aspx?word=BRAZIER

http://www.ensignmessage.com/archives/hebrew.html