Blom is a Norwegian family descended from Jan Fredriksen (died 1624), a citizen of Skien. 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. 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. 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.