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OP. We always used to try to think of what school nicknames or songs would the other kids make up about a name... and try to thwart that. Mindyou they will always make up something but don't make it so easy for them.
A hypenated first name is very Hollywood.
A lot of people have suggested Delilah.. but I think you'd have people singing the Tom Jones song at her.
Isla on the other hand is classic, not over used and beautiful.