[_Soulou]

I think it's my real name, proof underneath :-)

http://i.imgur.com/onAPdMr.jpg

[vidarh]

Any interesting story behind the surname?

(Might be worth explaining why it sounds made up/like a pseudonym: Unbekannt in German means unknown; similar variations has the same meaning in a range of Germanic languages)

[_Soulou]

Interesting not really, someone in my family made some research about its past and return to the XVIIth century. From there, we can only make assumptions.