What do you think about this baby name?

My daughter's name is Salem. Her name means 'peace' in Hebrew. It was also the original name for Jerusalem in the old testament of the bible. Our prayer for her life is that she will seek God for peace in her life, and also that she will have a peaceful presence about her all her days. And she does! She is the most laid back easy going kid I have EVER met! She is such a sweet little darling! Anywho, I'm pregnant with another girl and we want to name her Millo. (Pronounced my-low) The name means 'rampart' or 'citadel' in Hebrew. It's a barrier that was used during battle to protect the warriors. The spiritual connotation for that name would be, my prayer for her life is that she will guard her heart from evil and hate and strife and let God be her protector instead of doing it on her own strength. What do you think? And what about the spelling?? I've thought about changing the spelling so pronunciation isn't a problem; maybe Mylo.