This is just a question out of curiosity but would you find it odd if you came across a sibling set that included (for example) both an Arthur and a Guinevere, since they were a married couple?
Or another famous couple, like a Helen and a Paris (male), or Elizabeth and Darcy, or even Romeo and Juliet (somehow to me this one would seem weirder than some fo the others)
Or even something Biblical, like Mary and Joseph, or Abraham and Sarah or Adam and Eve