Certainly a very patchy area. The only explicitly named, as said above, are the Witch-king of Angmar, and his second in command Khamūl.
At least three of them were of Black Nśmenórean race.
Khamūl was a lord of Easterlings, and was the only Nazgūl known by his name, although there has been some speculation that Gothmog, Lieutenant of Barad-dūr, may have been a Nazgūl. That said, Gothmog generally isn't an especially clear part of the canon, what with Gondolin-Goth as well...
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And all the rest is literature
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