I think
Farah is a gorgeous name. I think
Farrah looks a bit like a stutter, honestly. It reminds me of the actress (which is a shame as I usually like to stay away from celebrity names). Farrah/Farah and
Jacqueline as a sibset sounds fine, but like someone else mentioned,
Farrah and
Jacqueline were both
Charlie's Angels so someone might think "oh like the angels!!" But if that doesn't bother you, then it's cool.
Conclusion:
Farah! :)