well this explains it:

So what are the ingredients of a sexy name? For boys, a good name will contain vowel sounds made at the front of the mouth, such as 'e' or 'i' sounds; names with fuller, rounder vowel sounds such as 'u' tend to score lower. So pat yourself on the back if you're called Ben... but if your name is Paul you might have to work harder to snare a date.

FULL ARTICLE HERE