Some years ago, Sven already wantet to work at the english wikipedia and created an account named User:SvenK. Nowadays, with WP:SUL, simply call him User:Sven.
In the german wikipedia, Sven is known as Benutzer:Benji. On the Wikimedia Commons, he is known as User:Sven. Sven surely doesn't look at his discussion page on the english wikipedia very often – so if you need a fast answer or if your question is somewhat very important, you might consider to put your request on his german user talk page.