

Hmm. According to Wikipedia you are correct, and the original SEQUEL was simply renamed to SQL. https://en.wikipedia.org/wiki/SQL#History
I’m not sure how much that original SEQUEL/SQL has in common with later publicly-available SQL implementations. I never personally worked with SEQUEL but I was under the impression it was more of a spiritual predecessor to SQL than a direct ancestor. But I trust Wikipedia more than I trust my my memory here, so I guess I was wrong.
I don’t see how it could possibly be unintentional. It’s too bizarre.