Hahnium, also known as element 105, was named after Otto Hahn, a German chemist who made significant contributions to the field of nuclear chemistry. While there are no official synonyms for hahnium, there are alternative names that have been proposed for it in the past. Some of these include unnilpentium, eka-tantalum, and nielsbohrium, among others. These names are derived from the element's position in the periodic table and the contributions of famous scientists to the field of chemistry. Despite these proposed names, hahnium remains the official name for element 105 and is recognized as such by the International Union of Pure and Applied Chemistry (IUPAC).