I didn't think of
Wilhelm, that would be a good choice. I really like
Walther too, but with all these Nazi rumours around that man, true or not, I don't know if it's a good idea. :/ I don't think they would use
Lilian as a first name, she's probably not "royal enough" to name the heir after. But I can definitely see it on a younger child! And probably not
Sophia either, considering
Carl Philip's girlfriend.