Correct spelling for the English word "jahn" is [d͡ʒˈɑːn], [dʒˈɑːn], [dʒ_ˈɑː_n] (IPA phonetic alphabet).
The word "Jahn" is a German surname with origins in the Germanic language. It is derived from the given name Johannes, which is the German form of John. The name Johannes itself has its roots in Hebrew as Yochanan, meaning "Yahweh is gracious". Over time, the name evolved to variations such as Johan, Johann, Jens, and Jan in different Germanic-speaking regions. "Jahn" is a variant form specifically found in German-speaking areas.