Here's a site which not only gives you the meaning of the name, but also invites you to enter a survey on what you think of the name:
http://www.babyzone.com/babynames/babynamedisplay.asp?ID=5458
Here's a site belonging to another Espen who seems to know quite a bit about his name (which is derived from the Old Norse name "Asbjørn"):
http://www.espen.com/name.htm
You might want to try e-mailing him at:
self@espen.com
Good luck! :)
-- Nanaea