Dune’s Duke Atreides mystery solved – Can you crack it?

First name of the actor who portrayed Duke Atreides in “Dune”
Actor who played the character of Duke Atreides in “Dune”
Oscar ___, who acted as Duke Atreides in “Dune”
Isaac ___, known for his role as Duke Atreides in “Dune”
The actor known for playing Duke Atreides in “Dune” is named Oscar ___
The actor who portrayed the character of Duke Atreides in “Dune” is named Isaac ___