Phinda was one of two moons, along with Kera, which orbited the planet Tellar. (TOS reference: The Worlds of the Federation) "By Kera and Phinda!" was a common Tellarite exclamation, used similarly to the phrase "By Jove!" in Human culture. (TOS novel: Prime Directive, SCE eBook: Grand Designs, et al) Phinda was named for a Tellarite deity. (ENT - The Romulan War novel: Beneath the Raptor's Wing)