An fnord in the wild?

In modern English, that’s the most accepted way to say it. In ancient greek, we aren’t as sure, and some think that the mn sound was spoken, but we don’t have an English language equivalent sound so we just drop the first part.

Either way, if you pronounce fnord with a silent f, you still wouldn’t use “an”.

For the life of me, I always assumed “fnord” was a mis-hearing/mis-typing of “fnork” as made “famous” by Tim Conway in this Carol Burnett Show sketch (move on to 2:00 if you get bored and want to get on with the “fnork”).

I always think of that when I see “fnord.”