Correct spelling for the English word "vorn" is [vˈɔːn], [vˈɔːn], [v_ˈɔː_n] (IPA phonetic alphabet).
The word vorn originates from the German language. It is derived from the Middle High German word vürn, which means before or in front. The Old High German word for this is firni. Over time, the pronunciation and spelling evolved, and vorn became the modern German term for in front or ahead.