Grönvall is a Swedish surname. Geographical distribution. As of 2014, 71.7% of all known bearers of the surname Grönvall were residents of Sweden (frequency 1:10,856) and 25.9% of Finland (1:16,759). In Sweden, the frequency of the surname was higher than national average (1:10,856) in the following counties: 1. Skåne County (1:3,484) 2. Uppsala County (1:7,287) 3. Gävleborg County (1:7,569) 4. Halland County (1:8,047) 5. Värmland County (1:8,407) 6. Södermanland County (1:9,972) 7. Örebro County (1:10,563) 8.
https://en.wikipedia.org/wiki/Gr%C3%B6nvall