Need help with character names!
Well, I'm actually pretty terrible of thinking up character names myself, so I use a name generator to help me out. I'm not sure if you actually want to use a generator, but here's a link to a one that might help.
On a side note, I think Nathaniel would be a good name for one of the boys. Nathaniel Creed has a nice ring to it, but if you don't think so, I completely understand.
Anyways, I hope that something in this post was useful.
Good luck :)
(You're using the N already)
Otherwise, check online lists with popular or rare baby names
If you don't feel like using the name generator. I guess you could go with something like Rampossa, Julius, Constant, Henry, Bethan, Branwen, Cai, Anton, Sophia, Silvia, Synesia, Gawain, Seith, Wynne, Amatia, or Faenia.
The above is a mixed bag of nuts from Byzantine, Roman, and Welsh celtic names. But for the boys you could easily go Constant, Gawain, Cai. And then for the girls you could go Wynne, and Silvia or Faenia. But it's difficult to match old timey regal names with the surname creed. So I'd go with some from the above post.