Dana Elcar (known for tv-show McGyver) has Norwegian ancestry. He's first name is btw Ibsen.
William Petersen (C.S.I.) has Danish ancestry. He's from Illinois. I think his very stereotypically Danish-looking:
Swedish-Americans are the easiest group, since there are plenty of them. Sweden beeing the biggest Nordic country afterall. Steven Soderbergh has Swedish grandfather:
Icelandic-Americans are the most difficult to find, since there aren't too many of them. All I could come up with was actor Gunnar Hansen, who was born in Iceland, but moved to USA as a child:
Uma Thurman (Swedish/German mother)
Hayden Christensen (Danish father, half Swedish mother)
immy Fallon's wife Nancy Juvonen (Finnish descent), btw she looks extremely white American to me. Must be the hair and her white, wide smile.
Matt Damon, mother is of Finnish and Swedish descent.
Kirsten Dunst, Dunst's mother, who was born in New Jersey, is of German and Swedish descent
Robert Englund, He is of part Swedish ancestry, and can speak Swedish fairly well.
Edie Falco, Her father was of Italian descent and her mother's ancestry was Swedish and English.
James Franco, Franco's father was of Portuguese (from the Madeira island) and Swedish descent.
Jake Gyllenhaal, Gyllenhaal's father, who was raised as a Swedenborgian, is of Swedish and English descent, and is a descendant of the Swedish noble Gyllenhaal family.
Michelle Pfeiffer, Her father was of German, Dutch, and Irish descent, and her mother was of Swiss and Swedish ancestry.
Mark Wahlberg, His father was of half Swedish and half Irish ancestry,
Andy Richter , a half Swede , half german.
Norwegian Americans
Kristianna Loken
Kristen Wiig
Michelle Williams
Renée Zellweger (also part Norwegian Saami)
lastly Marilyn Monroe
Jessica Lange. Actress, half German/Dutch - half Finnish.
Carl Pellonpaa. Famous and long-running TV presenter in Michigan, has a show Finland Calling - has had it for something like 40 years. Born in US, but speaks Finnish fluently with an American accent.
Marian Nixon (b. Marian Nissinen), Fully Finnish, famous dancer/actress in 1920s-1936. Has a star in Hollywood walk of fame.
Timothy Kopra. Astronaut, half Finnish on father's side (Kopra is a Finnish name).
Albert Salmi. Actor, born in NY to Finnish parents.
David Chokachi. Actor (Baywatch lol), dad Turkish and mother Finnish.
Dwight Helminen. Ice hockey player.
George Gaynes. Actor, in the Police Academy films for example. Born in Helsinki, moved to US as a child.
Jorma Kaukonen. Renowned blues and rock guitarist, worked with Jefferson Airplane for example. Fully Finnish born in US.
Scott Lautanen. Director. (Lautanen means "plate" in Finnish)
Einar Aaron Swan. Composer, 1st generation American from Finland.
Patrick Swayze's widow, dancer Lisa Niemi, is Finnish American.
Ed Wood's protege, and 50's icon, Vampira (Maila Nurmi), is Finnish American
Actor Kevin Sorbo is Norweigian American
Matt Niskanen is a Minnesota-Finn:
Eliot Ness, the guy that caught Al Capone, was Norwegian-American:
Scarlett Johansson - half Danish
http://s1.zetaboards.com/anthroscape/topic/5051909/1/