No info yet
I'm a bit late to this party, but the name could be spelled, alternatively, "Jadus" which puts the Grecian or Latin s on the end and settles it pretty firmly into the male camp, at least for me. (I too promptly thought of the white witch, for which reason I would never name a girl Jadis, up on a boy I think it could work.)
Yup, I have confidence that Mr. Cumberbatch has and will restore his name to the usable and even popular name realm. Interestingly, I have an older copy of the Baby Wizard book, and this topic just came up between me and my husband:
Me- "It says here that Benedict isn't used much at the time of publication. I bet that's not true anymore!"
Husband- "After Benedict Arnold?"
Me- "I was thinking Cumberbatch myself, but whatever..."
We're both in our 20's, but I'm a bit more up on the influences of the pop culture curve than he is! ;)
This is what I wanted to say: you are saved in this scenario because Ben(jamin) is such a sturdy, traditional name. Even your SIL will likely have more than one association with the name, and since you don't see them often, that helps too. I would go with it!
My sister has a 3-year-old she named Kayden. I named my daughter Aria the following year. My grandma's remark: "Well, if we could get used to Kayden, we can get used to anything!" My sister and I weren't sure which of us should be more insulted. Mostly we just laugh. ;)
My daughter's name is Aria. I love it (obviously) and I also like both your girls' names. They all seem in the same "family" to me. Just throwing it out there. :)
Heehee, I clicked on this thread to see if anyone had suggested my favorite middle names for Tessa. I'm pregnant right now, and if it's a girl, I'm 95% sure we'll name her "Tessa." My husband says I get to pick the middle name and my top two picks are "Tessa Louise" (so classy!) and "Tessa Rose" (after my best friend's middle name). You suggested them both, so apparently I'm not alone! ;)