A lot of the .se registrars are in Sweden, but if you're just using it as a name hack then your options may be more limited (eNom/Tucows, Name.com, and Dyn (whi

A lot of the .se registrars are in Sweden, but if you're just using it as a name hack then your options may be more limited (eNom/Tucows, Name.com, and Dyn (which was acquired by Oracle and then subsequently by name.com)). Maybe try Hover? Based out of Canada, provided by Tucows. You might have to use more than one registrar to get coverage on all your regional domains, depending on how many you have.