helmi is the finnish word for pearl. that;s how i use to call my dear person. i like very much how finnish language sounds. and hyacinth is a genus of plant like water hyacinth or garden hyacinth. they are her favorite flowers.
I tried Latin, Spanish and Romanian translations for 'helmi' and 'hyacinth', but I didn't come up with anything non-obvious. I dislike it when I cannot make sense of then words, but I love the way they sound. Your author's note is the same as my review and perception- the beautiful presence of someone dear.