Helle 1

I like this name. It's a shame that it sounds like 'Hell', though.
To the previous comments, you do realize that this isn't an English name, correct? Also, it's already a nickname.

So...what could be a nickname for this? The only diminutive I see is when you remove the "e"...

Great. A curse word for a name.

So whoever names their kid this wants their kid to go to h***?! I don't get it...

Why would you name your daughter Hell with an E?

I really like this name. It has some strength to it, but at the same time it is very gentle in pronunciation, and thus very graceful. Many people don't like Helga because it sounds so harsh to them, but Helle doesn't have as much of this harshness, but still definitely isn't frilly or anything. I like that it sounds a little bit similar to Helena, which is one of my all time favourites. Though I wonder if it isn't a bit confusing for some English natives, as with English phonetics it would be pronounced like hell. Despite the fact that I like this name, I'd never call my child it, as here in Poland it doesn't seem particularly usable, but in an English-speaking country I'd be twice as cautious.