The book's written in the present but was written in the 90's. Her brother's name is
Evan and there was a reference to his Celtic coloring. Other than that there's no references to Wales. There are some pretty oddball names in the whole book, so there may not be rhyme or reason. Don't have the book with me now, but I'll get on in the next few days with a list of names for your amusement.
TempestGirl