The name Sapphire is a girl's name of Hebrew origin. Sapphire and is often added to lists like Color Names for Babies and discussed in our forums with posts like "Heaven/Hell/Purgatory Alphabetical Girls".
From the experts:
Sapphire goes waaaaay beyond Ruby and Pearl. This September birthstone, occasionally used a century ago, might be worth a reappraisal, perhaps as a Sophie/Sophia alternative. Sapphire is the pseudonym of Romona Lofton, who wrote the book Push, which was turned into the movie Precious.