Blom is a Norwegian family descended from Jan Fredriksen (died 1624), a citizen of Skien.[1][2] His son, parish priest Fredrik Blom (died 1657), Lårdal, adopted the family name Blom. According to playwright Henrik Ibsen, the family was one of the patrician families in Skien.[3] The family is related through marriage to families such as Cappelen, Løvenskiold, Paus and Aall.
The family adopted its coat of arms, featuring a sighthound, in the early 19th century.[4] The coat of arms is loosely based on coats of arms of other families with similar names, not known to be related to this family.