Arn is of Germanic origin, derived from the Old Norse element 'arinn', which means 'eagle power'. It is often considered a short form of names like Arnold and Arndt. Arn was quite popular among historical figures, including Arnulf of Carinthia, who was king of East Francia in the 9th century. Today, it continues to be used as a given name in various cultures, particularly in Scandinavia where it is often favored due to its Norse roots. In some cases, Arn may also be considered a unisex name, although it is more commonly associated with males.
The name Arn saw a peak in popularity during the late 1940s and early 1950s with seven births each year from 1949 to 1950, followed by a significant drop to five births in 1952. There was another spike in 1953 with eleven births before declining again until 1956 and 1959, with five and seven births respectively. After 1959, the name's popularity continued to fluctuate but remained relatively low until it experienced a slight resurgence in 2013 with five births. Overall, from 1949 to 2013, there were a total of sixty births named Arn.