Zatanna Zatara was created by Gardner Fox and Murphy Anderson back in Hawkman #4 (October-November 1964).
Zatanna is the daughter of the Golden Age character, magician Giovanni Zatara.
The character seems to be fairly popular despite not having attained superstar status.
I'm guessing like Black Canary, the fishnets have something to do with it.
That and her shadowy relationship with Batman.....
Besides Smallville, Zatanna has shown up in Batman: The Animated Series and Justice League Unlimited.
Back in 2005, screenwriter Hadley Davis proposed an action-comedy starring a teen-aged Zatanna, but nothing ever came of it.