Jantzen is of Scandinavian origin, derived from the Old Norse personal name Jónbjôrn, which consists of the elements 'Jón', meaning 'John', and 'bjôrn', meaning 'bear'. It was introduced to English-speaking countries by immigrants from Scandinavia in the late 19th and early 20th centuries. The name Jantzen is often associated with the Swedish-American clothing manufacturer, Jantzen Knitting Works, which was founded in Portland, Oregon, in 1910.
"From 1996 to 2000, there were a total of 14 babies named Jantzen."