I'm one of the few people who prn. it heh-LEN-a, and that's the only way I like it. HELL-en-a is harsh to me, and heh-LAY-na is very unattractive to my ears.
My personal combo is
Helena Firenze, but I love your
Helena Yocheved and
Helena Vivienne!
Kirsten is so overdone here, it makes me want to scream a bit.