Historical literature and biographical sources consistently refer to Austro-Hungarian Chief of the General Staff Franz Conrad von Hötzendorf by his last name, Conrad.
The claim states that Franz Conrad von Hötzendorf is commonly referred to by his given name Conrad (though chronologically and contextually in European historiography, 'Conrad' is actually his surname/family name used as a mononym shorthand, but the papers universally refer to him as 'Conrad'). The retrieved historical papers (e.g., papers 1, 2, 3, and 5) consistently shorten his full name to 'Conrad'. Since the claim is specific, empirical, and directly supported by the academic literature, it is judged as SUPPORTED.