Vala

Vala Mal Doran of Stargate SG-1 was once the host of a Goa'uld symbiote named Qetesh. After being freed by the Tok'ra, she became a planet hopping con artist. She attempted to steal Earth's first starship, Prometheus, but was thwarted by Daniel Jackson. She later sought out Daniel's help and through a piece of Goa'uld technology, became linked to him. Since they could not be apart without either of them dying, Vala stayed at Stargate Command, and eventually reformed enough to become a member of SG-1 herself. She was mother of the Orici, Adria, and in an alternate timeline, became lovers with Daniel Jackson. 

The Valar of Middle Earth are a race of angelic beings. Vala is the singluar form of the name. They are mentioned in The Lord of the Rings, but are mostly dealt with in the second part of The Silmarillion. They are the Powers of Arda (the world). They shaped the world and created beauty to counter the darkness of Melkor, aka Morgoth, from whom all evil in Middle Earth comes.

Vala is also the anglicized name of Völva, a shamanic seeress in Norse mythology. An asteroid, 131 Vala, was named for Völva.

There is a programming language called Vala. 

Vala is also a real name of Germanic origin. It means 'singled out'. According to the Social Security Administration, 13 girls were given the name Vala in 2011.