The name Bj is of Scandinavian origin and is a short form of the Old Norse name Bjørn which means "bear". This name has been popular in Scandinavia for centuries and has been used by many notable figures throughout history including the Norwegian explorer Fridtjof Nansen who was known as "Bjørn" to his friends. Despite its historical significance, Bj is not a very common name today and it may be considered unusual or unique depending on cultural and regional differences.
The name Bj seems to have been quite popular among parents from the late 1960s until the early 1980s, with over 30 births recorded each year between 1978 and 1981. However, its popularity has since declined significantly, with fewer than 20 births per year from 1990 onwards, and recent years seeing as few as 5 or 6 births annually. Overall, the name Bj has been given to a total of 711 children over the period spanning from 1964 to 2021.