Thank you very much for the clear and thoughtful response.
Although I understand your intention, my answer is the same with orochi's - it just does not really work.
Sometimes you can find kanji which has the same/similar meaning and sounds like people's name, but it is not always the case.
I don't doubt your knowledge and opinion, though I suppose I didn't intend to mean that it had to sound like an actual Japanese name, just that if you met someone with an unusual name, what reading might sound more fitting for a female.
For example, for my given name, 神恵, I've chosen the reading かんけい. I have no evidence to support that this kanji compound or reading is ever used as a name, but I'm happy with it, and my professors seem to like it as well. My surname actually translates to an actual Japanese surname, 黒川.
Japanese word for melody is primarily メロディ which is written in katakana.
When you're talking about the melody not in metaphorical/poetic context but more in music/academic context, it is 旋律 (senritsu), which sounds anything but person's name let alone female one.
The sound senritsu is also used for another word 戦慄 which means horror, chill, bloodcurdlingness - not very nice connotation.
Yes, I saw the word 旋律, but even before knowing that the primary reading could be mistaken for 戦慄, I couldn't find any readings for those kanji that could even pretend to sound like a name.
That was why I was looking at 主調 which has the following entry on WWWJDIC:
主調【しゅちょう】
keynote; main melody
明 means clear or bright (related light) and 約 means rules.
The word 明約 does not exist, but one can guess it could mean clear(ly written) rule.
Both my Kodansha Kanji Learner's Dictionary and WWWJDIC list a primary meaning of "promise" for 約, that was why I thought it might be acceptable to drop 束 from the compound.
Anyway, thank you very much for your reply. I'll try to think of some alternative, though it bothers me that a direct translation isn't forthcoming.