I know one, who is 2. I love the name, but agree that it doesn't sound great with Eloise (which is also a lovely name btw) - I think it's because of hte 'r' sound you have to make to join the two together, so it becomes like 'Sophiar Eloise'. As runoutofideas says, a name with a consonant at the start won't have the same effect, so Sophia Louise works better, IMO.