I have no troubles with double vowels.
As far as Desiderya goes - the character was created when I first started playing EVE, without any thoughts about RP. When I returned to the game I was already so twisted that MMORPGs without RPing were no fun for me anymore, so I figured I'd give it a try. And since it was a try I didn't want to start fresh SP wise. In hindsight, I'd chose differently today. But then Des wouldn't exist.
The last name was given in an attempt to get closer to PF. I'm still contemplating (DeadRow/Hikari reminds me of this every time) giving her a second name that's more caldari - a meh situation all around, since it'd be kind of a retcon.
PS: Anyone shortening the name to 'desi' will be subject to my personal OOC wrath. It might be a foreign thing, but it sounds awful to my ears.
PPS: What's in a name? - Letters.