| Hi Jeremy,
Since there is a parallel case (i.e. mabé or Mabé cultured pearls), you can wade through various reference works and see what is used more often. I still see no real need to capitalize it. Do you write "French fries" or "french fries?" According to Merriam Webster the primary form is not capitalized but capitalization is common. I guess this is a case where you can have it both ways whichever looks better to you at any given time.
Zeide |