I think as others say, you’re better off sticking the Broken Soul concept into the surname, since that is often written in English anyway, such as Whisperwind, Stormrage, etc.
Plus it would be slightly unusual I imagine to have ‘broken soul’ as a first name. Unless your character had no identity before.
I always consider Darnassisn not a full language, but more a series of phrases that Night Elves draw upon.
At the end of the day most people won’t get the reference, so it’s best to go with something you like the sound of, and then attach lore meanings on afterwards.
