The name Ulla is a girl's name of German, Scandinavian, Norse origin meaning "will, determination". Ulla and is often added to lists like Cool Baby Names That Start With U and discussed in our forums with posts like "Adding Then Eliminating -- Girls Themed".
From the experts:
Ulla, the beautiful, tall, sexy, blond Swedish secretary in "The Producers" (played by Uma Thurman in the movie) who purrs, "Ven you got it, flaunt it," has changed the image of this name forever. Ulla may stand on its own or be an abbreviation of Ursula or Ulrika; Ula may be seen as another spelling.