While you could ask where Sem and Senna came from--they're the top boy and girl names, respectively for 2004--it's more interesting to compare the classical (to my ear) Dutch names that were popular in 1939--Johannes, Jan, Hendrik, Willem, Johanna, Wilhelmina--with the more international-sounding mix of 2003 and 2004--Emma, Jesse, Amber, Demi, Kevin [what the-, Demi? Oh right, Charlie's Angels 2 came out in 2003. So that makes total sense.].
* The SVB is what pays you your Child Benefit, the EU900 yearly subsidy paid to people with children to offset the costs of raising a child in the Netherlands. Going by the name, I'd say it's like the US Social Security program. Except that it's for kids. And no one's trying to take it apart.]