Samantha is the name the company that developed the voice gave it. Nuance Technologies. I've heard that name used on the air before. The real life person is named Susan Bennett. An early version of the "Samantha" voice was actually used for the first implementation of Siri. Since then, the voice has been used for a multitude of different text-to-speech applications. I know for sure I've heard it in Ford's sync platform as well as on the local trains and buses announcing next stations etc. I chuckled when County Fire started using that system several years ago now. I believe Santa Clara County, San Jose, Mountain View, and Palo Alto now use the same Phoenix G2 alert system.