The only thing I can think of when I say
Tanith out loud is TANF (pronounced like 'tannif'), 'Temporary Assistance to Needy Families' - a welfare program. That takes away from the name, imo. But what about...
Tanith JuliaTanith GenevieveTanith RebeccaTanith ZephyrineTanith AmeliaTanith Serenity