Trying to decide between a few names

Kay • Mom of 3 boys- Oct 2012, Feb 2014, & Aug 2016. Daughter due May 2018. NICU/Preemie Mom.
We are completely set on a boys name for this baby, but can't agree/settle on a girls name. We have a short list, but I can't get comfortable with any as a final choice.  Our current kids are Zachariah Felix (nn Zach) and Benjamin Caius (nn Benny).   Our last name is short and very common. 
Our boy choice is Tobias Asher (nn Toby). 
 Girls options are:
 
Vivian Joy (nn Vivi)- Vivian is after my maternal grandmother who I was very close to, who passed in 2001. Joy is because all our children's middle names mean happy in some way. 
Emmeline Grace (nn Emmie)- I have always loved the name Emmeline, after Emmeline Pankhurst. I don't love Grace, but it fits the positive theme and I disliked Joy with Emmeline. 
Emmeline Judith (nn Emmie)- again, I love Emmeline. I like Judith because it is biblical like my sons names, and means praise, but I worry that the "ith" sound will be hard to manage as our first name starts with S. 
Rebekah Hope (nn Becky)- I have always loved Becky for a name, but now that we have a Benny, I worry it's too close and would leave our older son feeling as the odd man out.  It's also our least favorite choice overall. 
So of those names, what do you like or dislike, and why?