The planet Kazar is the homeworld of the Kazarite race. (TOS movie: Star Trek: The Motion Picture production materials)

Starfleet serviceman Rakaar was born on Kazar. (TOS comic: "A Small Matter of Faith")

The Jarol Desert on Kazar was the home of the Mestiko government-in-exile from 2274 to 2282. Following the return of the Zamestaad to Mestiko in 2282, the ousted mar-Atyya Synod was in turn sent into exile on Kazar. (TOS - Mere Anarchy eBook: The Darkness Drops Again)