Söderman is a Swedish surname. Geographical distribution. As of 2014, 78.3% of all known bearers of the surname Söderman were residents of Sweden (frequency 1:4,500) and 20.0% of Finland (1:9,816). In Sweden, the frequency of the surname was higher than national average (1:4,500) in the following counties: 1. Gävleborg County (1:2,000) 2. Uppsala County (1:2,082) 3. Stockholm County (1:2,550) 4. Jämtland County (1:2,672) 5. Västmanland County (1:3,016) 6. Västernorrland County (1:3,088) 7. Värmland County (1:3,963) 8.
https://en.wikipedia.org/wiki/S%C3%B6derman