The surname was changed several times over the years by his descendants, for instance Seiverson, Seivers, Severs.
Sources
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DNA Connections
It may be possible to confirm family relationships with Tor by comparing test results with other carriers of his Y-chromosome or his mother's mitochondrial DNA.
However, there are no known yDNA or mtDNA test-takers in his direct paternal or maternal line.
It is likely that these autosomal DNA test-takers will share some percentage of DNA with Tor: