I came to this discussion page wondering the same thing. Maybe someone thought it would be clever to emphasize the "Mega" even though that has nothing to do with the word's etymology.

The page also appears as Meganekko depending on how you reach it. The Mega Nekko links look like someone getting confused with the unrelated Mega Neko trope. Alternately it might be someone who doesn't understand the etymology and is picking out the familiar 'mega' component, I've seen it mistranslated in fan discussions as 'huge glasses' with nekko being assumed as glasses.

I came here for the same reason. It used to properly be Meganekko last time I was on this page. Is there any reason why we can't change it back?

It's been done.

But what's this about alphabetizing examples?

Because Meganekko are sweet, shy and innocent, whereas Hot Librarians and Sexy Secretaries are sexy and seductive. Can't do both of those at the same time.