We don’t know the origin of the names and one can ask similar for France and Germany,
Offhand I found 2 of the Swiss were born in Macedonia actually:
http://us.soccerway.com/teams/switzerland/switzerland/2201/
http://us.soccerway.com/players/blerim-dzemaili/209/ Born in Macedonia
http://us.soccerway.com/players/admir-mehmedi/44428/ Born in Macedonia
http://us.soccerway.com/players/valon-behrami/206/ Kosovo so probably Albanian, he’s been with Switzerland a few years.
http://us.soccerway.com/players/josip-drmic/115078/ Yugoslav name, born in Swiss.
http://us.soccerway.com/players/mario-gavranovic/83269/
Same as preceding player.
Who knows? Maybe this is an effect of people being forced out because of the war. No idea really.
I just thought it was kind of ironic, since Switzerland is a notoriously tough place to get foreign citizenship.