Oh wow, congratulations!
The only ones I know are Sylvian, Julian (pronounced Whoo-lean), Menno, Joepie, Sjoerd for boys and Miriam, Francien, Annemieka (sp), Mathilde, Veerie, Yetska (sp) for girls.
My cousins are half Dutch but of course also half English so a lot of names used in that side of the family are common, like Tom and Daniel. One thing they do do in Holland is take the first part of the first and middle names and create a longer name that becomes the name they commonly use. For example Annemieka, my aunt, is taken from Anne-something and then a weird Dutch middle name, and the two combined.
Also, stalking my youngest cousin's FB page a lot of the names aren't too Dutch sounding. For example the first names are Eva, Merel, Ruby and Marissa. There is a Luuk (boy) and Marloes (girl) in tagged photos though, and they are pretty cool IMO.