Who really cares about whether something is "certified" UNIX? Certification is not some seal of quality. "Unix" is commonly understood to denote "functional" unix systems as well for lack of a more convenient term.

That os what the UNIX-like expression is for.

OS X would have been the only one certified. Even then I wouldn't call it a BSD per-se.

Oh, didn't realize you meant only certified Unices. I'll be on my way...