Siri is a name, it's fairly common in Norway where one of the co-founders of the company that built Siri comes from. [Dag Kittlaus]

In this* article Dag says that he was going to call his first child Siri, but it turned out to be a boy.

* http://e24.no/it/norges-ukjente-dollar-multimillionaer/20119...