While reading through the Alpha pdf, I saw the suggested first names for the characters. Some of them sounded a little bit off, not really keeping with the period. I checked the most common names by decade with the Swedish Bureau of Statistics (it's all online), and for kids born in the 1970's, the top ten were:
Johan
Fredrik
Mikael
Daniel
Magnus
Mattias
Anders
Peter
Andreas
Jonas
Anna
Maria
Linda
Jenny
Malin
Sara
Camilla
Åsa
Ulrika
Marie
The 15 most common surnames are:
Andersson
Johansson
Karlsson
Nilsson
Eriksson
Larsson
Olsson
Persson
Svensson
Gustafsson
Pettersson
Jonsson
Jansson
Hansson
Bengtsson
...but if you want more variety, the top 100 can be found here: the 100 most common Swedish surnames.