Any textbook sold at a national level is going to contain names that most children are unfamiliar with anyway, because:

1) Melting pot
2) Parental preference for unusual names

So, short of having teachers rewrite the textbook each year for whatever vogue names showed up in that particular age range (since about half the parents who go looking for unusual names in any given year end up picking the same one), it's something you'll just have to deal with.