I have a Pearl who is nearly 4 years old - so I love it.
The only trouble i have had which i did nott foresee is people pronouncing it incorrectly, for example other children at dd's nursery - i got a couple of Xmas cards addressed to 'Pell' because the parents could not figure out what their toddler was saying!
But in 4 years we have never met another little girl called Pearl, which is nice!