I don't think it'd be weird at all and I think it'd be perfectly fine, but then I've never seen the problem of using names outside of your nationality or culture. I prefer Shoshana to Susannah too, and I think it's a gorgeous name. ShoshanaRuby is just darling. :)
Thank you! I've always gone back and forth on Susannah, but I've loved Shoshana consistently since I first discovered it, so it feels like a safer option for me.