The first time I heard this name (pronounced TEER-zah) was in the movie Ben-Hur. In it, Tirzah was Ben-Hur's sister who, when Ben-Hur was banished, fell ill with leprosy along with her mother. I won't go on, because then I'll spoil the movie!
Anyway, from the first time I heard Tirzah, I thought it was an absolutely beautiful name, full of elegance, spirit, even some sorrow.
This the ONLY site on which I could find MY name! And the site is dead on about the origin! But just to mix it up. My name is TIRSA (tear-sa), my mom thought she was making it more mainstream that way. But really it's the Spanish version!