From the experts:
Sela is a Biblical place-name, the original term for the city of Petra, which is finding new life through actress Sela Ward, star of several TV series. The young daughter of singer Lauryn Hill is named Selah, pronounced the same but with a different derivation and meaning. Found on early African-American slave lists, it was sometimes spelled Cela or Cella.
In one of its other incarnations, Selah is a word frequently (71 times!) found in the Book of Psalms, as a musical term that means "pause." It is the last word in Anita Diamant's novel The Red Tent.
The name entered the Top 1000 in 2005 and is now at Number 534.
Trivia tidbit: Sela Ward's father and brother are named Granberry.