Out of curiosity, what did you end up naming them? I usually rename characters when given the chance, but for some reason I kept the original names of the family. Now it is too late for me to change (even though technically still possible); I have become accustomed to the more Egyptian sounding names.
Fun fact: quick internet check (cannot vouch for the accuracy) tells me..
Ain (younger) means eye, though in some more northern languages it can mean own
Shani (older) means scarlet, marvel, wondrous
Zahra means beautiful, bright