Willemijntje den Ouden went by Willy.
Adriaan Van den Hoof goes by Adje, and Andy.
Dennis Carl Gleason goes by Denboy, Dark Wing Dennis, and Den.
Knut Borglin went by Knut den Store, and Den Sjungande Tandlkaren.
David Gohman goes by Go-Go.
After you battle with your rival at the Dragon's Den he shows up when you're climbing the stairs to battle the Pokemon League again
Tom van Den Broek goes by Brookee.
Didier Van den Hove goes by Didou.
Adriaan Van den Hoof goes by Adje, and Andy.
Povl Sabroe went by Den Gyldenblonde.
Nick Denbeigh goes by Nick Den.
Leslie Grantham goes by Dirty Den.
Raimar van den Bylaardt II goes by Brazilian Ray.
Carolyn Churchman went by Den Mother to the Decent.
Marijohn Wilkin went by The Den Mother of Music Row.
Bertil Boo went by Den sjungande bonden (The singing farmer).
Dennis Carl Gleason goes by Denboy, Dark Wing Dennis, and Den.
Gerben van den Hoven goes by Gerben.