That's not directly related, because both of their names are foreign -- Lenalee's name is Chinese, and Lavi's name is like, Hebrew I think -- and so there is no natural romanization. When Hoshino said that their names were spelled Lenalee and Lavi, I shrugged and went with those, because it's the official way she wanted those non-English names romanized.

But Crowley is a name. We all were sure it was Crowley until we saw her mangling the roman letters. And when she said Jerry is spelled Jeryy -- that -- no. ;_; His name is Jerry.