There’s nothing wrong with bugs. It’s all about intent, and he clearly intended to hide this from her because he knew (correctly) it would be a problem for her. So it was a lie by withholding relevant information. About their daughters name. Its messed up. It’s also dumb because it’s so easy to look up the origin of a name that this “secret” isn’t really one at all.
I see your point, but can’t square it.
If he had said “I didn’t think it mattered so I didn’t think to tell her” that would make sense, but the fact that he said he deliberately hid it (ie harmless secret) means he knew she wouldn’t like it. Which makes sense because I think it would be pretty common to get “no” for an answer when you ask your spouse if you can name your kid after a bug.